If you log in to your host and type
dig github.com
does it resolve? It’s not resolving anywhere that I can find.
; <<>> DiG 9.9.5-3ubuntu0.9-Ubuntu <<>> github.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 17584
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;github.com. IN A
;; Query time: 5003 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Fri Oct 21 14:13:00 EDT 2016
;; MSG SIZE rcvd: 39
root@forum:/var/discourse#
Right this minute 8.8.8.8 and 8.8.4.4 don’t find github and the ones of github’s DNS servers that I checked are unreachable. I’d wait a while before debugging this further
Tech Email: hostmaster@github.com
Name Server: ns2.p16.dynect.net
Name Server: ns3.p16.dynect.net
Name Server: ns4.p16.dynect.net
Name Server: ns1.p16.dynect.net