›_ Claude Code Issues
Claude Code Issues / #14350

[BUG] Latest Claude desktop version fails to fallback to url ${resource}/.well-known/openid-configuration

Resolved 💬 5 comments Opened Dec 17, 2025 by sivankri Closed Feb 14, 2026

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?

The MCP server Url is https://%dnsname%/adb/mcp/v1/databases/%database-name%.

When accessed without bearer token, claude previously invokes url GET https://%dnsname%/adb/mcp/v1/databases/%database-name%/.well-known/openid-configuration

But suddenly this stopped working after this release. We did not implement any /.well-known/oauth-protected-resource endpoint since it was working previously.

As per spec mentioned here https://modelcontextprotocol.io/specification/draft/basic/authorization it should support point 3

  1. OAuth 2.0 Authorization Server Metadata with path insertion: https://auth.example.com/.well-known/oauth-authorization-server/tenant1
  2. OpenID Connect Discovery 1.0 with path insertion: https://auth.example.com/.well-known/openid-configuration/tenant1
  3. OpenID Connect Discovery 1.0 path appending: https://auth.example.com/tenant1/.well-known/openid-configuration

What Should Happen?

The MCP server Url is https://%dnsname%/adb/mcp/v1/databases/%database-name%.

When accessed without bearer token, claude should invoke below url to get auth endpoints.
GET https://%dnsname%/adb/mcp/v1/databases/%database-name%/.well-known/openid-configuration

Error Messages/Logs

[86757] Received error (status unknown): HTTP 404: Invalid OAuth error response: SyntaxError: Unexpected token '<', "<html>
<he"... is not valid JSON. Raw body: <html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset=ISO-8859-1"/>
<title>Error 404 Not Found</title>
</head>
<body><h2>HTTP ERROR 404 Not Found</h2>
<table>
<tr><th>URI:</th><td>/register</td></tr>
<tr><th>STATUS:</th><td>404</td></tr>
<tr><th>MESSAGE:</th><td>Not Found</td></tr>
<tr><th>SERVLET:</th><td>default</td></tr>
</table>

</body>
</html>

Steps to Reproduce

  1. Create a MCP server. POST https://%dnsname%/x
  2. Return 401 if no bearer token is passed.
  3. Create endpoint GET https://%dnsname%/x/.well-known/openid-configuration
  4. Check if this endpoint is called by claude.

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

Claude 1.0.2339 (1782e2) 2025-12-16T19:35:52.000Z

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_

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