Capistrano Deployment to server with non-standard SSH port

I recently changed the default SSH port of one of my client’s servers. It appears that the first time I tried to deploy via Capistrano it hanged and I had to kill the task.

export GIT_ASKPASS="/bin/echo" GIT_SSH="/tmp/somerepo/git-ssh.sh" ; /usr/bin/env git ls-remote git@github.com:someuser/somerepo.git

I added the GIT_SSH_COMMAND export to give some debug.

export GIT_SSH_COMMAND="ssh -vvv" export GIT_ASKPASS="/bin/echo" GIT_SSH="/tmp/somerepo/git-ssh.sh" ; /usr/bin/env git ls-remote git@github.com:someuser/somerepo.git

It appears to be connecting on the custom port for that new server.

export GIT_SSH_COMMAND="ssh -vvv" export GIT_ASKPASS="/bin/echo" GIT_SSH="/tmp/somerepo/git-ssh.sh" ; /usr/bin/env git ls-remote git@github.com:someuser/somerepo.git
OpenSSH_6.9p1, OpenSSL 1.0.2d 9 Jul 2015
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug2: ssh_connect: needpriv 0
debug1: Connecting to github.com [192.30.253.112] port 1234.

So for some inexplicable reason it’s trying to forward using the same port as the initial connection is made from. I can’t find an option to turn this off in the Capistrano 3 config so I am going to force the port to be 22. Editing ~/.ssh/config on the server with the following fixes it. Be sure if this is a new file to chmod permissions to 644.

Host github.com
Port 22