lhotari commented on issue #25074:
URL: https://github.com/apache/pulsar/issues/25074#issuecomment-3655059387

   "Unable to retrieve OAuth 2.0 server metadata" 
   
   This problem occurs when the broker or function worker cannot access the 
.well-known/openid-configuration endpoint, 
https://github.com/apache/pulsar/blob/9937d22ffea22b199fd5782153ebb4a9c2f25391/pulsar-client/src/main/java/org/apache/pulsar/client/impl/auth/oauth2/protocol/DefaultMetadataResolver.java#L59-L73
   (There's #25052 to make this configurable, but that shouldn't make a 
difference to Keycloak)
   
   Perhaps there has been a change in Keycloak configuration instead? You might 
not notice issues in broker-to-broker authentication immediately and that's 
perhaps the reason why it disabling functions worker seems to fix the issue.


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