I have two AD / DNS servers for my internal clients. One is running Server 2016 (dc1) and the other is running Server 2012 R2 (dc2). I have been notified that my clients are unable to connect to the host https://www.ruffalonl.com. It appears this is boiling down to a name resolution error. I've tried using NSLookup and connecting to both of my DNS servers to make the following queries with both servers yielding the same results:
Z:\>nslookup
Default Server: dc1.mydomain.local
Address: 192.168.88.15
Default Server: dc1.mydomain.local
Address: 192.168.88.15
> ruffalonl.com
Server: dc1.mydomain.local
Address: 192.168.88.15
Server: dc1.mydomain.local
Address: 192.168.88.15
Non-authoritative answer:
Name: ruffalonl.com
Address: 184.168.131.241
Name: ruffalonl.com
Address: 184.168.131.241
> www.ruffalonl.com
Server: dc1.mydomain.local
Address: 192.168.88.15
Server: dc1.mydomain.local
Address: 192.168.88.15
DNS request timed out.
timeout was 2 seconds.
DNS request timed out.
timeout was 2 seconds.
*** Request to dc1.mydomain.local timed-out
> server 192.168.88.12
Default Server: dc2.mydomain.local
Address: 192.168.88.12
timeout was 2 seconds.
DNS request timed out.
timeout was 2 seconds.
*** Request to dc1.mydomain.local timed-out
> server 192.168.88.12
Default Server: dc2.mydomain.local
Address: 192.168.88.12
> ruffalonl.com
Server: dc2.mydomain.local
Address: 192.168.88.12
Server: dc2.mydomain.local
Address: 192.168.88.12
Non-authoritative answer:
Name: ruffalonl.com
Address: 184.168.131.241
Name: ruffalonl.com
Address: 184.168.131.241
> www.ruffalonl.com
Server: dc2.mydomain.local
Address: 192.168.88.12
Server: dc2.mydomain.local
Address: 192.168.88.12
DNS request timed out.
timeout was 2 seconds.
DNS request timed out.
timeout was 2 seconds.
*** Request to dc2.mydomain.local timed-out
timeout was 2 seconds.
DNS request timed out.
timeout was 2 seconds.
*** Request to dc2.mydomain.local timed-out
Does anyone have any ideas as to why my servers would be unable to resolve the www host? If I have NSLookup make the same query against 8.8.8.8, it successfully resolves:
> server 8.8.8.8
Default Server: google-public-dns-a.google.com
Address: 8.8.8.8
Default Server: google-public-dns-a.google.com
Address: 8.8.8.8
> www.ruffalonl.com
Server: google-public-dns-a.google.com
Address: 8.8.8.8
Server: google-public-dns-a.google.com
Address: 8.8.8.8
Non-authoritative answer:
Name: rnl-web.lb.ruffalonl.com
Address: 72.50.228.74
Aliases: www.ruffalonl.com
Name: rnl-web.lb.ruffalonl.com
Address: 72.50.228.74
Aliases: www.ruffalonl.com