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Exam AWS Certified SysOps Administrator - Associate topic 1 question 106 discussion

Exam question from Amazon's AWS Certified SysOps Administrator - Associate
Question #: 106
Topic #: 1
[All AWS Certified SysOps Administrator - Associate Questions]

A company is using Amazon CloudFront to serve static content for its web application to its users. The CloudFront distribution uses an existing on-premises website as a custom origin.
The company requires the use of TLS between CloudFront and the origin server. This configuration has worked as expected for several months. However, users are now experiencing HTTP 502 (Bad Gateway) errors when they view webpages that include content from the CloudFront distribution.
What should a SysOps administrator do to resolve this problem?

  • A. Examine the expiration date on the certificate on the origin site. Validate that the certificate has not expired. Replace the certificate if necessary.
  • B. Examine the hostname on the certificate on the origin site. Validate that the hostname matches one of the hostnames on the CloudFront distribution. Replace the certificate if necessary.
  • C. Examine the firewall rules that are associated with the origin server. Validate that port 443 is open for inbound traffic from the internet. Create an inbound rule if necessary.
  • D. Examine the network ACL rules that are associated with the CloudFront distribution. Validate that port 443 is open for outbound traffic to the origin server. Create an outbound rule if necessary.
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Suggested Answer: A 🗳️
by princajen at Sept. 4, 2022, 6:18 p.m.
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princajen
Highly Voted 2 years, 1 month ago
Selected Answer: A
A! is correct HTTP 502 errors from CloudFront can occur because of the following reasons: There's an SSL negotiation failure because the origin is using SSL/TLS protocols and ciphers that aren't supported by CloudFront. There's an SSL negotiation failure because the SSL certificate on the origin is expired or invalid, or because the certificate chain is invalid. There's a host header mismatch in the SSL negotiation between your CloudFront distribution and the custom origin. The custom origin isn't responding on the ports specified in the origin settings of the CloudFront distribution. The custom origin is ending the connection to CloudFront too quickly. https://aws.amazon.com/premiumsupport/knowledge-center/resolve-cloudfront-connection-error/
upvoted 16 times
tamng
10 months ago
great !
upvoted 1 times
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konieczny69
Most Recent 10 months, 2 weeks ago
Selected Answer: A
https://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/http-502-bad-gateway.html#origin-not-responding-on-specified-ports could be C, however the keyword is that it used to work and stopped hence A
upvoted 2 times
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bruppp31
11 months, 2 weeks ago
I think this could be A or B. Both are equally as likely. The certificate could either be expired or doesn't match. Reference: https://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/http-502-bad-gateway.html
upvoted 1 times
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Christina666
1 year, 3 months ago
Selected Answer: A
An HTTP 502 status code (Bad Gateway) indicates that CloudFront wasn't able to serve the requested object because it couldn't connect to the origin server. https://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/http-502-bad-gateway.html
upvoted 2 times
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braveheart22
1 year, 8 months ago
A is the way here
upvoted 1 times
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michaldavid
1 year, 10 months ago
Selected Answer: A
aaaaaaaaa
upvoted 1 times
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