How to troubleshoot issues with authentication tokens?

Authentication tokens are crucial for maintaining secure sessions in applications, but issues can arise that hinder their effectiveness. Here are some steps to troubleshoot common problems with authentication tokens:

• Check Token Expiry: Ensure the token has not expired. Tokens often have a validity period after which they become unusable.
• Token Format: Verify that the token is in the correct format (e.g., JWT, OAuth). Invalid formats can cause authorization errors.
• Server Time Synchronization: Check if the server's clock is synchronized correctly, as discrepancies can lead to token validation failures.
• Inspect Token Claims: Examine the claims within the token to ensure they have the expected values, including scopes and permissions.
• Check Revocation Lists: If using a revocation strategy, ensure the token has not been revoked by checking against your revocation list.
• Verify Signing Key: Make sure the signing key used to create the token is the same key the server is using to validate it.

By following these steps, you can identify and resolve most issues related to authentication tokens.