Change ForwardAuth error log level from DEBUG to ERROR #12324
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kevinpollet
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nmengin
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Dec 1, 2025
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Thank you for your contribution @murataslan1.
As it's a bugfix, could you rebase the PR on the branch v3.6 to allow us to merge it please?
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Done! I've changed the base branch to v3.6. The PR is now ready for merge. |
When the ForwardAuth middleware fails to reach the authentication server, it returns a 500 error but logs at DEBUG level, making it difficult to diagnose issues in production without enabling debug logging. This change promotes the error log to ERROR level for better observability. Fixes traefik#12234
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🚫 the mergeable state is "blocked" |
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What does this PR do?
When the ForwardAuth middleware fails to reach the authentication server, it returns a 500 error but logs at DEBUG level, making it difficult to diagnose issues in production without enabling debug logging.
This change promotes the error log to ERROR level for better observability.
Motivation
As reported in #12234, when the ForwardAuth middleware cannot reach the auth server (e.g., DNS resolution failure, network issues), users receive 500 errors with no indication in logs unless DEBUG level is enabled. This makes troubleshooting production issues very difficult.
Example log before this change:
Example log after this change:
Changes
Debug()toError()inpkg/middlewares/auth/forward.goline 198Fixes #12234