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When I try to connect via SSH to GitHub from my Ubuntu 22.04 server (i just want to pull from a private repository) I get timeout.

I've seen similar questions to mine but non of the possible solutions worked for me.

Pinging to github.com works properly.

I've tried to run ssh -vT [email protected] and this is all I get:

user@server:~/.ssh$ ssh -vvvT [email protected]
OpenSSH_8.9p1 Ubuntu-3ubuntu0.4, OpenSSL 3.0.2 15 Mar 2022
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: include /etc/ssh/ssh_config.d/*.conf matche                                                          d no files
debug1: /etc/ssh/ssh_config line 21: Applying options for *
debug3: expanded UserKnownHostsFile '~/.ssh/known_hosts' -> '/root/.ssh/known_ho                                                          sts'
debug3: expanded UserKnownHostsFile '~/.ssh/known_hosts2' -> '/root/.ssh/known_h                                                          osts2'
debug2: resolving "github.com" port 22
debug3: resolve_host: lookup github.com:22
debug3: ssh_connect_direct: entering
debug1: Connecting to github.com [140.82.121.4] port 22.
debug3: set_sock_tos: set socket 3 IP_TOS 0x10
(Stays here until timeout)

From my Windows Desktop (that is in the same network) I get Hi <my username>! You've successfully authenticated, but GitHub does not provide shell access.

I added the public key from .ssh folder to github. I even tried to use the same key my Windows PC uses without any luck.

I tried to connect to the 443 port like it's suggested on similar discussions but It behaves the same way.

I disabled the firewall and I still get the same errors.

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7
  • 1
    Just to be clear, you shouldn't add your private SSH key (.ssh/id_rsa) to Github, but rather your public key (.ssh/id_rsa.pub). Anyway, what happens if you use the flag -o IPQoS=none in your ssh command above?
    – htor
    Commented Oct 23, 2023 at 21:43
  • Thank you for answering, It works with your flag! Does It mean I have QoS Policies defined in my system by default? What does it imply and what actions should I take?
    – Carles Fitó Negre
    Commented Oct 24, 2023 at 15:55
  • 1
    I've set my ssh_config to ignore IPQoS with IPQos none. I tried disableing my routers QoS to test it and the issue was still happening, so I'm guessing it has something to do with my server.
    – Carles Fitó Negre
    Commented Oct 24, 2023 at 16:22
  • 1
    If it had worked, then it would have implied that your router (usually it's the router) had some completely broken handling for "new style" (i.e. post-1998) DSCP QoS markings. (When OpenSSH switched from ToS to DSCP a few years ago, it actually uncovered a few things like VMware completely failing to handle such packets...)
    – grawity_u1686
    Commented Oct 24, 2023 at 16:26
  • Have you reloaded/restarted your ssh daemon after changing the config?
    – htor
    Commented Oct 24, 2023 at 16:28

1 Answer 1

Reset to default
1

Running the command with -o IPQoS=none solved the issue in my particular case. I edited ssh_config and added the line IPQoS none, this way it will always perform ssh without Quality of Service.

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1
  • Still times out, in my case :(
    – Tony Power
    Commented Mar 24 at 14:06

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