AWS - Elastic Load Balancing
An Application Load Balancer is set with HTTPS listener on port 443 and forwards traffic to backend instances on HTTPS port 8443. Clients report SSL errors. What is the likely cause?
An Application Load Balancer is set with HTTPS listener on port 443 and forwards traffic to backend instances on HTTPS port 8443. Clients report SSL errors. What is the likely cause?
medium📝 Debug Q7 of 15
Step-by-Step Solution
Solution:
Step 1: Check listener SSL certificate requirement
HTTPS listener requires a valid SSL certificate attached to terminate SSL from clients.Step 2: Identify impact of backend certificate trust
Load balancer must trust backend certificates; self-signed certs cause SSL errors.Final Answer:
Backend instances use self-signed certificates not trusted by the load balancer -> Option CQuick Check:
Backend cert trust required for HTTPS target group [OK]
Quick Trick: Backend certs must be trusted by load balancer [OK]
Common Mistakes:
MISTAKES- Ignoring SSL certificate attachment on listener
- Assuming backend protocol causes client SSL errors
- Confusing listener port with certificate issues
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