Gitlab ssh connection timeout (with Cloudflare and Client crt) - ssh

Question

I can't connect to my gitlab server. The webUI is secured with Cludflare and Client cert. But that should not really matter because I want to connect with ssh
ssh -Tvvv git#gitlab.domain
OpenSSH_8.9p1 Ubuntu-3, OpenSSL 3.0.2 15 Mar 2022
debug1: Reading configuration data /home/userdir/.ssh/config
debug1: /home/userdir/.ssh/config line 1: Applying options for gitlab.domain
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: include /etc/ssh/ssh_config.d/*.conf matched no files
debug1: /etc/ssh/ssh_config line 21: Applying options for *
debug3: expanded UserKnownHostsFile '~/.ssh/known_hosts' -> '/home/userdir/.ssh/known_hosts'
debug3: expanded UserKnownHostsFile '~/.ssh/known_hosts2' -> '/home/userdir/.ssh/known_hosts2'
debug2: resolving "gitlab.domain" port 12345
debug3: resolve_host: lookup gitlab.domain:12345
debug3: ssh_connect_direct: entering
debug1: Connecting to gitlab.domain [123.123.123.123] port 12345.
debug3: set_sock_tos: set socket 3 IP_TOS 0x10
debug1: connect to address 123.123.123.123 port 12345: Connection timed out
debug1: Connecting to gitlab.domain [123.123.123.123] port 12345.
debug3: set_sock_tos: set socket 3 IP_TOS 0x10
~/.ssh/config
Host gitlab.domain
HostName gitlab.domain
User gitlabuser
Port 12345
PreferredAuthentications publickey
IdentityFile ~/.ssh/git
(The key is stored in the corresponding account)
What could be the reason for this?

Answer 1

As long as a curl -v telnet://gitlab.domain:12345 shows you a timeout, that means:
either the network route is not opened between your machine and gitlab.domain:12345
or gitlab.domain does not listen on port 12345
Double-check your GitLab ssh port configuration and make sure it is up and running, using the port you need.