DNS_PROBE_FINISHED_NXDOMAIN

Question

I am using Route 53 to host my domain
 `tryprospect.com`
.  
  
Under it, I have configured
 `chrome-extension.tryprospect.com`
 to point to an Amazon CloudFront distribution.  
  
This was done using an `A - IPV4 Address` record with an Alias Target of the CloudFront distribution.  
  
However some of my users randomly see a DNS_PROBE_FINISHED_NXDOMAIN error. I can't reproduce this on my machine, but several users have complained.  
  
Did I misconfigure this? How do I fix this?  
  
Help!

Answer

Hi,  
  
Your DNS configuration is fine now.   
  
However, if you recently changed the name servers that are associated with your domain registration, that could be the problem. DNS recursive resolvers typically cache the names of your name servers for two days. If some of your users are using DNS resolvers that cached the old name servers right before you changed to new name servers, they might still using the old name servers. "How Amazon Route 53 routes traffic for your domain" in the _Route 53 Developer Guide_ explains how DNS works, including the part about resolver caching:  
  
https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/welcome-dns-service.html#welcome-dns-service-how-route-53-routes-traffic  
  
If you haven't changed name servers recently, you might want to post your query on the CloudFront forum:  
  
https://forums.aws.amazon.com/forum.jspa?forumID=46  
  
Scott

DNS_PROBE_FINISHED_NXDOMAIN

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