Though I have the same problem that is in this question, But I am facing another problem i.e, even https://github.com/ is not running in the browser and showing that this webpage is not available and this happens after I installed Heroku.
Cannot access github from terminal and not even from browser.
After diagnosis I get to know that this problem is related to my WiFi because when I try to open https://github.com/ in mobile using mobile data, It is opening but when I connect my mobile to WiFi then same problem i.e, this webpage is not available and when I use mobile data internet in my laptop I am able to access the site but when using WiFi this webpage is not available.
I am running Ubuntu(Linux), dual boot with Windows-7
PING 188.8.131.52 (184.108.40.206) 56(84) bytes of data. 64 bytes from 220.127.116.11: icmp_seq=1 ttl=57 time=144 ms 64 bytes from 18.104.22.168: icmp_seq=2 ttl=57 time=71.4 ms 64 bytes from 22.214.171.124: icmp_seq=3 ttl=57 time=192 ms 64 bytes from 126.96.36.199: icmp_seq=4 ttl=57 time=112 ms 64 bytes from 188.8.131.52: icmp_seq=5 ttl=57 time=137 ms 64 bytes from 184.108.40.206: icmp_seq=6 ttl=57 time=58.0 ms 64 bytes from 220.127.116.11: icmp_seq=7 ttl=57 time=83.6 ms 64 bytes from 18.104.22.168: icmp_seq=8 ttl=57 time=104 ms 64 bytes from 22.214.171.124: icmp_seq=9 ttl=57 time=128 ms
unknown host 126.96.36.199
This definately looks like a DNS issue, you can access sites via IP but not through the URL.
You need to configure your routers DNS settings, personally I would set them to Google's DNS servers
188.8.131.52 (primary) 184.108.40.206 (secondary)
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