### Preflight Checklist - [x] I have searched [existing issues](https://github.com/anthropics/claude-code/issues?q=is%3Aissue%20state%3Aopen%20label%3Abug) and this hasn't been reported yet - [x] This is a single bug report (please file separate reports for different bugs) - [x] I am using the latest version of Claude Code ### What's Wrong? I am working in AWS Bedrock, with the latest version of claude code (as of this posting v2.0.8). Since the v2.x.x versions of claude code, and it might b

[BUG] AWS Bedrock SSO federation login endpoint spamming until 429 error

Status Fixed / completed

Maintainer reply ✓ Yes — ant-kurt

Activity 12 comments · opened Oct 6, 2025 · closed Nov 14, 2025

💡 Likely answer: A maintainer (ant-kurt, collaborator) responded on this thread — see the highlighted reply below.

Preflight Checklist

[x] I have searched existing issues and this hasn't been reported yet
[x] This is a single bug report (please file separate reports for different bugs)
[x] I am using the latest version of Claude Code

What's Wrong?

I am working in AWS Bedrock, with the latest version of claude code (as of this posting v2.0.8).

Since the v2.x.x versions of claude code, and it might be specifically with Sonnet 4.5, whenever claude is working I get constant aws sso logins because claude is hammering the federation/credentials endpoint. Occasionally I'll see 429 errors when doing basic things like switching models.

I connected mitmproxy to see what was going on, and I wasn't suprised to see that there are 10's/100's of these requests fired off in a tight loop with every new message into claude:

`[::1]:57479: GET https://portal.sso.us-east-1.amazonaws.com/federation/credentials?account_id=xxxx&role_name=xxx
host: portal.sso.us-east-1.amazonaws.com
connection: keep-alive
x-amz-sso_bearer_token: xxxx
x-amz-user-agent: aws-sdk-js/3.840.0
user-agent: aws-sdk-js/3.840.0 ua/2.1 os/darwin#25.0.0 lang/js md/nodejs#24.5.0 api/sso#3.840.0 m/E
amz-sdk-invocation-id: xxxx
amz-sdk-request: attempt=3; max=3
accept: /
accept-language: *
sec-fetch-mode: cors
accept-encoding: br, gzip, deflate

account_id: 'xxxx'
role_name: xxxx

<< 429 Too Many Requests 104b
Date: Mon, 06 Oct 2025 15:44:03 GMT
Content-Type: application/json
Content-Length: 104
Connection: keep-alive
Access-Control-Expose-Headers: RequestId
Access-Control-Expose-Headers: x-amzn-RequestId
RequestId: xxxx
Server: AWS SSO
x-amzn-RequestId: xxxx

{
"message": "HTTP 429 Unknown Code",
"__type": "com.amazonaws.switchboard.portal#TooManyRequestsException"
}`

Looking at the post message exchange connection teardown, you can see just many connections were opened:

[16:48:43.978][[::1]:61855] client disconnect [16:48:43.978][[::1]:61863] client disconnect [16:48:43.978][[::1]:61848] client disconnect [16:48:43.979][[::1]:61892] client disconnect [16:48:43.979][[::1]:61855] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:43.980][[::1]:61863] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:43.980][[::1]:61848] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:43.980][[::1]:61892] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:43.980][[::1]:61875] client disconnect [16:48:43.980][[::1]:61871] client disconnect [16:48:43.980][[::1]:61880] client disconnect [16:48:43.981][[::1]:61875] server disconnect bedrock-runtime.us-eas***************om:443 (54.209.111.40:443) [16:48:43.981][[::1]:61871] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:43.981][[::1]:61880] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:43.981][[::1]:61873] client disconnect [16:48:43.981][[::1]:61894] client disconnect [16:48:43.981][[::1]:61884] client disconnect [16:48:43.982][[::1]:61873] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:43.982][[::1]:61894] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:43.982][[::1]:61884] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.001][[::1]:61889] client disconnect [16:48:44.001][[::1]:61889] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.002][[::1]:61890] client disconnect [16:48:44.002][[::1]:61890] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.002][[::1]:61878] client disconnect [16:48:44.002][[::1]:61878] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.007][[::1]:61885] client disconnect [16:48:44.007][[::1]:61885] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.008][[::1]:61893] client disconnect [16:48:44.008][[::1]:61893] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.008][[::1]:61899] client disconnect [16:48:44.008][[::1]:61868] client disconnect [16:48:44.008][[::1]:61897] client disconnect [16:48:44.009][[::1]:61899] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.009][[::1]:61868] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.009][[::1]:61897] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.009][[::1]:61901] client disconnect [16:48:44.009][[::1]:61872] client disconnect [16:48:44.009][[::1]:61901] server disconnect bedrock-runtime.us-east-1.amazonaws.******* (54.209.111.40:443) [16:48:44.010][[::1]:61872] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.010][[::1]:61895] client disconnect [16:48:44.010][[::1]:61895] server disconnect bedrock-runtime.us-east-1***************443 (54.209.111.40:443) [16:48:44.010][[::1]:61900] client disconnect [16:48:44.011][[::1]:61902] client disconnect [16:48:44.011][[::1]:61900] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.011][[::1]:61902] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.011][[::1]:61865] client disconnect [16:48:44.011][[::1]:61888] client disconnect [16:48:44.011][[::1]:61898] client disconnect [16:48:44.012][[::1]:61865] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.012][[::1]:61888] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.012][[::1]:61898] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.034][[::1]:61896] client disconnect [16:48:44.035][[::1]:61896] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.035][[::1]:61891] client disconnect [16:48:44.036][[::1]:61891] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.036][[::1]:61887] client disconnect [16:48:44.036][[::1]:61920] client disconnect [16:48:44.036][[::1]:61908] client disconnect [16:48:44.037][[::1]:61887] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.037][[::1]:61920] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.037][[::1]:61908] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.037][[::1]:61923] client disconnect [16:48:44.037][[::1]:61915] client disconnect [16:48:44.037][[::1]:61913] client disconnect [16:48:44.038][[::1]:61923] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.038][[::1]:61915] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.038][[::1]:61913] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.072][[::1]:61910] client disconnect [16:48:44.073][[::1]:61910] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.074][[::1]:61911] client disconnect [16:48:44.074][[::1]:61919] client disconnect [16:48:44.075][[::1]:61911] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.076][[::1]:61919] server disconnect bedrock-runtime.us-east-1.amazonaws.c**************.111.40:443) [16:48:44.076][[::1]:61930] client disconnect [16:48:44.077][[::1]:61930] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.077][[::1]:61934] client disconnect [16:48:44.077][[::1]:61922] client disconnect [16:48:44.077][[::1]:61929] client disconnect [16:48:44.078][[::1]:61932] client disconnect [16:48:44.078][[::1]:61909] client disconnect [16:48:44.078][[::1]:61912] client disconnect [16:48:44.078][[::1]:61931] client disconnect [16:48:44.079][[::1]:61934] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.079][[::1]:61922] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.079][[::1]:61929] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.079][[::1]:61932] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.080][[::1]:61909] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.080][[::1]:61912] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.080][[::1]:61931] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.101][[::1]:61950] client disconnect [16:48:44.101][[::1]:61950] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.123][[::1]:61921] client disconnect [16:48:44.124][[::1]:61921] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.126][[::1]:61917] client disconnect [16:48:44.127][[::1]:61917] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.128][[::1]:61935] client disconnect [16:48:44.128][[::1]:61925] client disconnect [16:48:44.128][[::1]:61918] client disconnect [16:48:44.129][[::1]:61935] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.130][[::1]:61925] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.130][[::1]:61918] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.130][[::1]:61916] ***************** [16:48:44.131][[::1]:61916] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.131][[::1]:61924] client disconnect [16:48:44.132][[::1]:61914] client disconnect [16:48:44.132][[::1]:61924] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.133][[::1]:61914] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.133][[::1]:61928] client disconnect [16:48:44.134][[::1]:61933] client disconnect [16:48:44.134][[::1]:61928] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.134][[::1]:61933] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.137][[::1]:61960] client disconnect [16:48:44.137][[::1]:61960] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.155][[::1]:61953] client disconnect [16:48:44.155][[::1]:61953] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.184][[::1]:61332] client disconnect [16:48:44.185][[::1]:61332] server disconnect portal.sso.us-east-1.amazonaws.com*************43.202:443) [16:48:44.186][[::1]:61954] client disconnect [16:48:44.186][[::1]:61954] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.187][[::1]:61966] client disconnect [16:48:44.187][[::1]:61955] client disconnect [16:48:44.187][[::1]:61956] client disconnect [16:48:44.188][[::1]:61966] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.188][[::1]:61955] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.189][[::1]:61956] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.189][[::1]:61962] client disconnect [16:48:44.189][[::1]:61962] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.207][[::1]:61331] client disconnect [16:48:44.208][[::1]:61331] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:44.208][[::1]:61329] client disconnect [16:48:44.208][[::1]:61329] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:44.208][[::1]:61330] client disconnect [16:48:44.209][[::1]:61334] client disconnect [16:48:44.209][[::1]:61330] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:44.209][[::1]:61334] server disconnect p********************amazonaws.com:443 (3.219.243.202:443) [16:48:44.209][[::1]:61327] client disconnect [16:48:44.209][[::1]:61957] client disconnect [16:48:44.209][[::1]:61327] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:44.210][[::1]:61957] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.210][[::1]:61952] client disconnect [16:48:44.210][[::1]:61952] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.210][[::1]:61949] client disconnect [16:48:44.211][[::1]:61949] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.211][[::1]:61961] client disconnect [16:48:44.211][[::1]:61961] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.211][[::1]:61958] client disconnect [16:48:44.211][[::1]:61951] client disconnect [16:48:44.211][[::1]:61965] client disconnect [16:48:44.212][[::1]:61964] client disconnect [16:48:44.212][[::1]:61328] client disconnect [16:48:44.212][[::1]:61335] client disconnect [16:48:44.212][[::1]:61958] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.212][[::1]:61951] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.212][[::1]:61965] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.212][[::1]:61964] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.213][[::1]:61328] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:44.213][[::1]:61335] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:44.218][[::1]:61341] client disconnect [16:48:44.219][[::1]:61341] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:44.219][[::1]:61346] client disconnect [16:48:44.219][[::1]:61346] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:44.219][[::1]:61347] client disconnect [16:48:44.220][[::1]:61347] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:44.220][[::1]:61353] client disconnect [16:48:44.220][[::1]:61348] client disconnect [16:48:44.220][[::1]:61353] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:44.220][[::1]:61348] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:44.238][[::1]:61337] client disconnect [16:48:44.238][[::1]:61337] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:44.238][[::1]:61340] client disconnect [16:48:44.239][[::1]:61340] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:44.239][[::1]:61344] client disconnect [16:48:44.239][[::1]:61360] client disconnect [16:48:44.239][[::1]:61344] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:44.240][[::1]:61360] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:44.240][[::1]:61352] client disconnect [16:48:44.240][[::1]:61345] client disconnect [16:48:44.240][[::1]:61349] client disconnect [16:48:44.240][[::1]:61352] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:44.240][[::1]:61345] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:44.240][[::1]:61349] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:44.240][[::1]:61359] client disconnect [16:48:44.241][[::1]:61359] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:44.241][[::1]:61357] client disconnect [16:48:44.242][[::1]:61336] client disconnect [16:48:44.242][[::1]:61339] client disconnect [16:48:44.242][[::1]:61343] client disconnect [16:48:44.242][[::1]:61356] client disconnect [16:48:44.242][[::1]:61357] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:44.242][[::1]:61336] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:44.242][[::1]:61339] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:44.243][[::1]:61343] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:44.243][[::1]:61356] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:44.243][[::1]:61354] client disconnect [16:48:44.243][[::1]:61351] client disconnect [16:48:44.243][[::1]:61385] client disconnect [16:48:44.243][[::1]:61379] client disconnect [16:48:44.243][[::1]:61354] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:44.244][[::1]:61351] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:44.244][[::1]:61385] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:44.244][[::1]:61379] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:44.264][[::1]:61998] client disconnect [16:48:44.264][[::1]:61998] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.265][[::1]:61968] client disconnect [16:48:44.265][[::1]:61968] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.265][[::1]:61364] client disconnect [16:48:44.265][[::1]:61363] client disconnect [16:48:44.265][[::1]:61364] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:44.266][[::1]:61363] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:44.267][[::1]:61362] client disconnect [16:48:44.267][[::1]:61362] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:44.267][[::1]:61372] client disconnect [16:48:44.267][[::1]:61372] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:44.267][[::1]:61367] client disconnect [16:48:44.268][[::1]:61368] client disconnect [16:48:44.268][[::1]:61367] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:44.268][[::1]:61368] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:44.268][[::1]:61374] client disconnect [16:48:44.269][[::1]:61374] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:44.269][[::1]:61378] client disconnect [16:48:44.269][[::1]:61384] client disconnect [16:48:44.269][[::1]:61378] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:44.270][[::1]:61384] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:44.270][[::1]:61969] client disconnect [16:48:44.270][[::1]:61967] client disconnect [16:48:44.270][[::1]:61970] client disconnect [16:48:44.270][[::1]:61365] client disconnect [16:48:44.270][[::1]:61369] client disconnect [16:48:44.270][[::1]:61969] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.270][[::1]:61967] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.271][[::1]:61970] server disconnect 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[16:48:44.280][[::1]:61388] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:44.280][[::1]:62042] client disconnect [16:48:44.280][[::1]:61401] client disconnect [16:48:44.281][[::1]:62042] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:44.281][[::1]:61401] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:44.294][[::1]:61396] client disconnect [16:48:44.294][[::1]:61396] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:44.294][[::1]:61394] client disconnect [16:48:44.294][[::1]:61394] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:44.295][[::1]:61399] client disconnect [16:48:44.295][[::1]:61399] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:44.295][[::1]:61400] client disconnect [16:48:44.295][[::1]:61398] client disconnect [16:48:44.295][[::1]:61400] server 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disconnect [16:48:44.901][[::1]:61286] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:44.919][[::1]:61283] client disconnect [16:48:44.920][[::1]:61283] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:44.921][[::1]:61307] client disconnect [16:48:44.921][[::1]:61307] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:44.932][[::1]:61280] client disconnect [16:48:44.932][[::1]:61280] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:44.934][[::1]:61287] client disconnect [16:48:44.934][[::1]:61287] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:44.951][[::1]:61293] client disconnect [16:48:44.951][[::1]:61293] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:44.969][[::1]:61297] client disconnect [16:48:44.970][[::1]:61297] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:44.981][[::1]:61315] client disconnect [16:48:44.981][[::1]:61315] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:44.983][[::1]:61296] client disconnect [16:48:44.984][[::1]:61296] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:44.985][[::1]:61277] client disconnect [16:48:44.986][[::1]:61277] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:45.135][[::1]:61300] client disconnect [16:48:45.136][[::1]:61300] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:45.138][[::1]:61299] client disconnect [16:48:45.138][[::1]:61299] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:45.166][[::1]:61298] client disconnect [16:48:45.167][[::1]:61298] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:45.178][[::1]:61270] client disconnect [16:48:45.179][[::1]:61270] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:45.201][[::1]:61275] client disconnect [16:48:45.202][[::1]:61275] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:45.205][[::1]:61271] client disconnect [16:48:45.205][[::1]:61271] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:45.210][[::1]:61272] client disconnect [16:48:45.210][[::1]:61272] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:45.226][[::1]:61291] client disconnect [16:48:45.226][[::1]:61291] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:45.246][[::1]:61274] client disconnect [16:48:45.247][[::1]:61274] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:45.253][[::1]:61273] client disconnect [16:48:45.254][[::1]:61273] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:45.307][[::1]:61743] client disconnect [16:48:45.308][[::1]:61743] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:45.320][[::1]:61276] client disconnect [16:48:45.320][[::1]:61276] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:45.410][[::1]:61267] client disconnect [16:48:45.411][[::1]:61267] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:45.420][[::1]:61268] client disconnect [16:48:45.421][[::1]:61268] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:45.430][[::1]:61732] client disconnect [16:48:45.431][[::1]:61732] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:45.458][[::1]:61728] client disconnect [16:48:45.458][[::1]:61728] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:45.469][[::1]:61266] client disconnect [16:48:45.470][[::1]:61266] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:45.509][[::1]:61269] client disconnect [16:48:45.510][[::1]:61269] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:45.511][[::1]:61265] client disconnect [16:48:45.512][[::1]:61265] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:45.651][[::1]:61754] client disconnect [16:48:45.652][[::1]:61754] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:45.675][[::1]:61263] client disconnect [16:48:45.676][[::1]:61263] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:45.720][[::1]:61256] client disconnect [16:48:45.722][[::1]:61256] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:45.738][[::1]:61258] client disconnect [16:48:45.739][[::1]:61258] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:45.740][[::1]:61259] client disconnect [16:48:45.741][[::1]:61259] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:45.742][[::1]:61253] client disconnect [16:48:45.742][[::1]:61253] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:45.743][[::1]:61261] client disconnect [16:48:45.744][[::1]:61261] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:45.744][[::1]:61264] client disconnect [16:48:45.745][[::1]:61264] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:45.749][[::1]:61257] client disconnect [16:48:45.749][[::1]:61257] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:45.750][[::1]:61260] client disconnect [16:48:45.751][[::1]:61260] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:45.755][[::1]:61783] client disconnect [16:48:45.756][[::1]:61783] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:45.764][[::1]:61254] client disconnect [16:48:45.764][[::1]:61254] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:45.765][[::1]:61799] client disconnect [16:48:45.766][[::1]:61799] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:45.797][[::1]:61262] client disconnect [16:48:45.797][[::1]:61262] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:45.807][[::1]:61255] client disconnect [16:48:45.808][[::1]:61255] server disconnect portal.sso.us-east-1.amazonaws.com:443 (3.219.243.202:443) [16:48:45.855][[::1]:61761] client disconnect [16:48:45.857][[::1]:61761] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443) [16:48:45.858][[::1]:61804] client disconnect [16:48:45.859][[::1]:61804] server disconnect bedrock-runtime.us-east-1.amazonaws.com:443 (54.209.111.40:443)

This makes claude entirely unusable because every request will fire off hundreds of these API calls, getting my account/IP blocked for several minutes. Each time this happens claude will trigger my awsAuthRefresh call which fires off more requests and prolongs the 429 error.

This is worse in v2.0.8 than v2.0.5, but either wasn't happening in the v1.x.x client, or was happening less often that it didn't trigger the 429 error from AWS, or it's related to the sonnet 4.5 release.

This is happening with the model us.anthropic.claude-sonnet-4-5-20250929-v1:0[1m] since we cannot use the "global" one in our org.

What Should Happen?

Claude should not continually spam the federated login endpoint. It should get credentials as needed, then not call the endpoint again until the token expires or different authentication errors happen that mean the awsAuthRefresh should be called.

Error Messages/Logs

Steps to Reproduce

Be authenticated using aws sso login
Use the model us.anthropic.claude-sonnet-4-5-20250929-v1:0[1m]
Try to do anything and get 429 errors

It seems to behave this way when resuming a conversation and starting a new one.

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.0.8

Platform

AWS Bedrock

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_

View original on GitHub ↗

12 Comments

github-actions[bot] · 10 months ago

Found 3 possible duplicate issues:

This issue will be automatically closed as a duplicate in 3 days.

If your issue is a duplicate, please close it and 👍 the existing issue instead
To prevent auto-closure, add a comment or 👎 this comment

🤖 Generated with Claude Code

ashleigh-hopkins · 10 months ago

Found 3 possible duplicate issues: 1. [[BUG] awsAuthRefresh is not working properly after upgrade to claude code 2.0 #8447](https://github.com/anthropics/claude-code/issues/8447) 2. [[BUG] Claude Code doesn't inherit refreshed AWS credentials from SAML-to in GitHub Codespaces, causing 403 "security token expired" errors every 30 minutes #5737](https://github.com/anthropics/claude-code/issues/5737) 3. [[BUG] awsAuthRefresh is not used by claude code #6561](https://github.com/anthropics/claude-code/issues/6561) This issue will be automatically closed as a duplicate in 3 days. If your issue is a duplicate, please close it and 👍 the existing issue instead To prevent auto-closure, add a comment or 👎 this comment 🤖 Generated with Claude Code

It's similar but I don't think it's the same issue as #8447. Claude doesn't use the response from my refresh script, but it does display it. I think it's happening because eventually claude decides that the 429 response means the authorization token has expired, but it's actually causing it itself by spamming the federation/credentials endpoint.

ant-kurt collaborator · 10 months ago

Would you mind running Claude Code with the --debug flag? Should provide some information about whether the awsAuthRefresh is failing or something else is going on. Generally wouldn't expect 429 to trigger re-auth in Claude Code, so it's likely something else is failing.

jaginn · 10 months ago

I am having issues with this too. Claude Code is repeatedly calling the AWS federated login endpoint and reporting successful login. The configuration has not changed.

The tool is not usable right now :(

ashleigh-hopkins · 10 months ago

Would you mind running Claude Code with the --debug flag? Should provide some information about whether the awsAuthRefresh is failing or something else is going on. Generally wouldn't expect 429 to trigger re-auth in Claude Code, so it's likely something else is failing.

I don't see anything extra in the claude CLI when running with --debug, but another error I get after my awsAuthRefresh is run is:

Error: Authentication verification failed: An error occurred (TooManyRequestsException) when calling the GetRoleCredentials operation (reached max retries: 4): HTTP 429 Unknown Code which is clearly related to claude spamming the endpoint (or a bug in the AWS SDK?)

For reference this is the full claude command line I'm using:

SHELL=/bin/bash MAX_THINKING_TOKENS=31999 CLAUDE_CODE_MAX_OUTPUT_TOKENS=32000 CLAUDE_CODE_USE_BEDROCK=1 AWS_PROFILE=<profile> AWS_REGION=us-east-1 ANTHROPIC_MODEL='us.anthropic.claude-sonnet-4-5-20250929-v1:0[1m]' claude --dangerously-skip-permissions -c --debug

ashleigh-hopkins · 10 months ago

~~For what it's worth, some combination of these additional AWS flags seems to have solved the constant auth refresh issues and claude appears stable:~~

AWS_MAX_ATTEMPTS=1 AWS_RETRY_MODE=standard AWS_EC2_METADATA_V1_DISABLED=true AWS_CREDENTIAL_CACHE_TIME=3600 AWS_DISABLE_REQUEST_COMPRESSION=true DEBUG=aws-sdk* AWS_SDK_LOAD_CONFIG=1

~~So a new CLI command that will probably work for most people (without opinionated options) is:~~

CLAUDE_CODE_USE_BEDROCK=1 AWS_PROFILE=<profile> AWS_REGION=<region> AWS_MAX_ATTEMPTS=1 AWS_RETRY_MODE=standard AWS_EC2_METADATA_V1_DISABLED=true AWS_CREDENTIAL_CACHE_TIME=3600 AWS_DISABLE_REQUEST_COMPRESSION=true DEBUG=aws-sdk* AWS_SDK_LOAD_CONFIG=1 claude

Nope that just helped for the first few minutes of the session. It's definitely still a problem.

ant-kurt collaborator · 10 months ago

When you run with --debug, you should see something like this:

Debug mode enabled
Logging to: /some/path/to/debug-logs/debug.txt

Can you look at that file for lines containing "AWS"? Trying to understand if you're getting failures of the helper function or what else is going on.

Also, please share what your awsAuthRefresh or awsCredentialExport helpers are doing (SSO login? third-party tooling?)

ashleigh-hopkins · 10 months ago

When you run with --debug, you should see something like this: `` Debug mode enabled Logging to: /some/path/to/debug-logs/debug.txt `` Can you look at that file for lines containing "AWS"? Trying to understand if you're getting failures of the helper function or what else is going on. Also, please share what your awsAuthRefresh or awsCredentialExport helpers are doing (SSO login? third-party tooling?)

Ah now I get it, with the debugging enabled, I see lots of log lines like this in the log file when using claude code 2.0.x:

[ERROR] Error: Error: Could not resolve authentication method. Expected either apiKey or authToken to be set. Or for one of the "X-Api-Key" or "Authorization" headers to be explicitly omitted
at yP.validateHeaders (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:1034:930)
at yP.buildHeaders (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:1034:8426)
at process.processTicksAndRejections (node:internal/process/task_queues:105:5)
at async yP.buildRequest (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:1034:7484)
at async yP.makeRequest (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:1034:3323)
at async TZ1 (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:1045:4233)
at async oY1 (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:2407:187)
at async Pq0 (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:2407:386)
at async Promise.all (index 103)
at async tY1 (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:2407:1453)

If I upgrade to 2.0.11, these same lines do not appear ~and it appears to work much better~. I will post more feedback later once I've had a few hours to use it.

ant-kurt collaborator · 10 months ago

Also - can you update to the latest AWS CLI? Got a few tentative reports that this fixed the issue

ashleigh-hopkins · 10 months ago

Also - can you update to the latest AWS CLI? Got a few tentative reports that this fixed the issue

Yep so I've upgraded to aws-cli/2.31.12 and claude-code/2.0.13, first impressions are good. No strange timeouts or 429 errors so far. With the former version 2.0.11 (awscli 2.28.x) I was still seeing strange behaviour and logs on the mitmproxy I was using to identify the issues, it appeared unstable and claude would regularly timeout making API calls seeming to get stuck on a request before eventually recovering. My janky solution was a vibed caching proxy for the federation/credentials with mitmproxy which was solving the problem for me, while introducing others because of how env variables leak to child processes (HTTP_PROXY/HTTPS_PROXY etc).

I will share more feedback later, tentatively it seems better and the issue might be resolved.

ashleigh-hopkins · 10 months ago

After a few days using it, I believe whatever changes were made have resolved the issues I was seeing before. Many thanks @ant-kurt!

github-actions[bot] · 9 months ago

This issue has been automatically locked since it was closed and has not had any activity for 7 days. If you're experiencing a similar issue, please file a new issue and reference this one if it's relevant.

[BUG] AWS Bedrock SSO federation login endpoint spamming until 429 error

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What's Wrong?

What Should Happen?

Error Messages/Logs

Steps to Reproduce

Claude Model

Is this a regression?

Last Working Version

Claude Code Version

Platform

Operating System

Terminal/Shell

Additional Information

12 Comments

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