3

I'm completely at a loss on this one.

I have a windows domain environment with 2 DNS servers, one on Windows Server 2008 R2 and one on Windows Server 2012.

Internal DNS resolution is fine. External resolution is fine as well, with one exception.

  • Any time I try to resolve Facebook.com in a browser, it fails.
  • This is domain wide, not restricted to my local machine.
  • NSLOOKUP returns Name: Facebook.com and no ip address on my local machine and the servers
  • I've checked the host files on my machine and both DNS servers.
  • I've ran /flushdns.
  • I went to both DNS servers and looked in the "Cached Lookups" section, and Facebook's A record is set to 127.0.0.1
  • After deleting the cached lookup and trying again I got the same result.
  • SSH'ing to the firewall and running DIG on the domain returns the following output:

    [HOSTNAME]:/# dig facebook.com
    
    ; <<>> DiG 9.9.6-P1 <<>> facebook.com
    ;; global options: +cmd
    ;; Got answer:
    ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 29742
    ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1
    
    ;; OPT PSEUDOSECTION:
    ; EDNS: version: 0, flags:; udp: 4096
    ;; QUESTION SECTION:
    ;facebook.com.                  IN      A
    
    ;; AUTHORITY SECTION:
    facebook.com.           890     IN      SOA     [OFFSITE LOCATION].com. 
    hostmaster.[OFFSITE LOCATION].com. 14 900 600 86400 3600
    
    ;; Query time: 0 msec
    ;; SERVER: 127.0.0.1#53(127.0.0.1)
    ;; WHEN: Mon Jun 18 15:55:31 CDT 2018
    ;; MSG SIZE  rcvd: 121
    

The "Offsite Location" in the AUTHORITY section is a company that my company just acquired. It seems like their DNS server is responding as the authoritative server for Facebook, but I don't know enough about DNS to say for sure.

Aside from contacting them, where do I go from here?

1
  • Presumably the forwarders in your DNS server are set to the other company's DNS server. Change them to 8.8.8.8?
    – Paul
    Jun 19, 2018 at 13:37

1 Answer 1

1

Resolution was found literally minutes after posting:

I got in contact with the offsite location. Apparently, they do in fact black hole Facebook, and my DNS server had a forwarder setup to forward to them.

So they removed the entry and everything is fine.

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