I have a small, Simple Active Directory domain set up in AWS using their Directory Service. It's been running fine for a year now. However, this morning, certain DNS queries that run through the domain fail mysteriously.
C:\>nslookup merrimack.com Server: AWS-68AE5FCF56.xxx.yyy.com Address: 10.50.11.113 DNS request timed out. timeout was 2 seconds. *** Request to AWS-68AE5FCF56.xxx.yyy.com timed-out
However, if I ask Google, it gives me the right answer immediately:
C:\>nslookup merrimack.com 126.96.36.199 Server: google-public-dns-a.google.com Address: 188.8.131.52 Non-authoritative answer: Name: merrimack.com Address: 184.108.40.206
This worked fine yesterday, and as I alluded, for a year prior. All servers joined to this AD domain have the same results, and other queries than to this one domain name seem fine.
C:\>nslookup pfizer.com Server: AWS-68AE5FCF56.xxx.yyy.com Address: 10.50.11.113 Non-authoritative answer: Name: pfizer.com Address: 220.127.116.11
I am not a very experienced domain operator. How might I diagnose or resolve this error?
Minor edit: the AWS console doesn't show anything wrong with the domain, and all other services (authentication, etc) seem to be working fine.