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DNS Failing to Lookup Particular Address

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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
> ruffalonl.com
Server:  dc1.mydomain.local
Address:  192.168.88.15
Non-authoritative answer:
Name:    ruffalonl.com
Address:  184.168.131.241
> www.ruffalonl.com
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
> ruffalonl.com
Server:  dc2.mydomain.local
Address:  192.168.88.12
Non-authoritative answer:
Name:    ruffalonl.com
Address:  184.168.131.241
> www.ruffalonl.com
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

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
> www.ruffalonl.com
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


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