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Hey everyone, I'm encountering a persistent issue with our user authentication API. When a user attempts to log in with valid credentials, the API returns a 401 Unauthorized error intermittently. I've checked the logs and there's no clear pattern or specific error message accompanying these failures. I've tried: - Verifying the JWT generation and validation logic. - Ensuring correct secret keys are used for signing. - Testing with different user accounts. Has anyone else faced a similar problem or have any suggestions on how to debug this further? I'm stuck and need to get this resolved ASAP. Thanks in advance!

Hi TechGuru_1, I had a similar issue a few months back. For me, it turned out to be a race condition with our token refresh mechanism. Sometimes, a newly issued token was being processed while an older, expired token was still considered valid by a different part of the system. Consider adding more granular logging around token expiry checks and see if that correlates with the 401 errors. Also, ensure your server clocks are perfectly synchronized. Even a few seconds difference can cause JWT validation issues.

@AppDev_Alice Great suggestion! To add to that, check the `nbf` (not before) and `exp` (expiration time) claims in your JWTs. If these are not set correctly or are inconsistently applied across requests, it could lead to these intermittent auth failures. Also, make sure your JWT library is up-to-date.