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You configured an ALB with HTTPS listener but forgot to attach an SSL certificate. What issue will occur?

medium📝 Debug Q14 of 15
AWS - Elastic Load Balancing
You configured an ALB with HTTPS listener but forgot to attach an SSL certificate. What issue will occur?
AThe ALB will route requests without encryption
BThe ALB will automatically generate a certificate and accept requests
CThe ALB will downgrade HTTPS requests to HTTP
DThe ALB will reject all HTTPS requests with a TLS handshake failure
Step-by-Step Solution
Solution:

  1. Step 1: Understand HTTPS listener requirements

    HTTPS listeners require a valid SSL certificate to establish secure connections.

  2. Step 2: Consequence of missing certificate

    Without a certificate, TLS handshake fails, causing ALB to reject HTTPS requests.

  3. Final Answer:

    The ALB will reject all HTTPS requests with a TLS handshake failure -> Option D

  4. Quick Check:

    HTTPS needs SSL cert; missing cert = handshake failure [OK]
Quick Trick: HTTPS listeners must have SSL certificates attached [OK]
Common Mistakes:
  • Assuming ALB auto-generates SSL certificates
  • Thinking ALB downgrades HTTPS to HTTP automatically
  • Believing ALB routes unencrypted traffic on HTTPS listener

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