### 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

Resolved 💬 12 comments Opened Oct 6, 2025 by ashleigh-hopkins Closed Nov 14, 2025

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_

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