Why doesn't my ISP want me to push code to github.com?

Question

linux

Can't connect via SSH to github.com:

[[email protected] ~]$ ssh -T github.com
Warning: Permanently added 'github.com,192.30.253.113' (ECDSA) to the list of known hosts.
Permission denied (publickey,password).
[[email protected] ~]$ cat ~/.ssh/config | grep -A 4 github
Host github.com
    User git
    Hostname github.com
    StrictHostKeyChecking no
    UserKnownHostsFile=/dev/null
    PreferredAuthentications publickey
    IdentityFile /home/tw/.ssh/keys/tw.private

I already played with the SSH settings as best I could, but the main joke is not in this, it swears only when I try to connect from my home Internet (SkyNet, St. Petersburg), I just turn on the VPN and everything works fine!
Clean Internet:

[[email protected] ~]$ traceroute github.com
traceroute to github.com (192.30.253.112), 30 hops max, 60 byte packets
 1  gateway (192.168.1.1)  1.163 ms  1.049 ms  1.020 ms
 2  188.243.50.1.pool.sknt.ru (188.243.50.1)  1.716 ms  2.345 ms  3.044 ms
 3  router.sknt.ru (93.100.0.34)  2.511 ms  2.963 ms  3.317 ms
 4  router.sknt.ru (93.100.0.124)  3.819 ms  4.195 ms  4.823 ms
 5  agg-m.gw1.sknt.ru (93.100.0.123)  4.827 ms  5.042 ms  5.515 ms
 6  ae14.rt.sl.spb.ru.retn.net (87.245.228.232)  6.996 ms  1.482 ms  1.661 ms
 7  ae3-8.rt.tc2.ams.nl.retn.net (87.245.233.17)  34.955 ms  35.583 ms  35.098 ms
 8  * * *
 9  * * *
10  github-inc.bear1.washington111.level3.net (4.15.136.22)  116.862 ms github-inc.bear1.washington111.level3.net (4.53.116.102)  117.276 ms github-inc.bear1.washington111.level3.net (4.15.136.22)  117.268 ms
11  * * *
12  * * *
13  lb-192-30-253-112-iad.github.com (192.30.253.112)  114.459 ms  114.505 ms  114.309 ms

VPN:

[[email protected] ~]$ traceroute github.com
traceroute to github.com (192.30.253.112), 30 hops max, 60 byte packets
 1  10.8.0.1 (10.8.0.1)  42.379 ms  61.777 ms  61.788 ms
 2  <! cutted, VPN gateway !> 61.812 ms  61.814 ms  61.815 ms
 3  unknown.Level3.net (212.187.139.53)  61.767 ms  61.769 ms  61.769 ms
 4  * * *
 5  GITHUB-INC.bear1.Washington111.Level3.net (4.15.136.22)  186.628 ms  186.641 ms GITHUB-INC.bear1.Washington111.Level3.net (4.53.116.102)  186.639 ms
 6  * * *
 7  * * *
 8  lb-192-30-253-112-iad.github.com (192.30.253.112)  196.609 ms  281.005 ms  281.091 ms
[[email protected] ~]$ ssh -T github.com
Warning: Permanently added 'github.com,192.30.253.113' (RSA) to the list of known hosts.
Hi lictw! You've successfully authenticated, but GitHub does not provide shell access.

The site itself is working, nothing is blocked! Changing keys doesn't help, creating a new account doesn't help, and I just can't figure out where to dig? what's happening? and how is that possible?
I'll add a more colorful display of the problem:

[[email protected] dgraph]$ git remote -v
origin	[email protected]:lictw/dgraph.git (fetch)
origin	[email protected]:lictw/dgraph.git (push)
[[email protected] dgraph]$ git pull origin master
Warning: Permanently added 'github.com,192.30.253.113' (ECDSA) to the list of known hosts.
Permission denied (publickey,password).
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.
[[email protected] dgraph]$ nmcli c up SLine-UK
Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/11)
[[email protected] dgraph]$ git pull origin master
Warning: Permanently added 'github.com,192.30.253.113' (RSA) to the list of known hosts.
From github.com:lictw/dgraph
 * branch            master     -> FETCH_HEAD
Already up-to-date.

Update: wrote in those. github support, I hope they will help, since most likely the problem is somewhere on their side ..

Answer 1

А почему бы не спросить тех. поддержку вашего провайдера?

Answer 2

Отвечу как пользователь того же провайдера, что и автор. Провайдер явно не причем, ибо у меня лично все гуд:)