A microservice is failing to authenticate requests from another service using JWT tokens. The tokens are valid but authentication still fails. What is a likely cause?

medium📝 Analysis Q6 of 15

Microservices - Authentication and Authorization

AThe sending service is using HTTP instead of HTTPS

BThe tokens are missing the user ID claim

CThe receiving service's clock is out of sync causing token expiration validation to fail

DThe tokens are encrypted instead of signed

Step-by-Step Solution

Solution:

Step 1: Consider token validation steps
JWT validation checks signature and expiration based on system clock.
Step 2: Identify clock sync impact
If clocks differ, tokens may appear expired or not yet valid, causing failure.
Final Answer:
The receiving service's clock is out of sync causing token expiration validation to fail -> Option C
Quick Check:
Clock sync issues cause token validation failure [OK]

Quick Trick: Ensure system clocks are synchronized for JWT validation [OK]

Common Mistakes:

MISTAKES

Assuming missing user ID claim causes failure
Confusing encryption with signing
Thinking HTTP vs HTTPS affects token validity

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A microservice is failing to authenticate requests from another service using JWT tokens. The tokens are valid but authentication still fails. What is a likely cause?

Step 1: Consider token validation steps

Step 2: Identify clock sync impact

Final Answer:

Quick Check:

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