ssh: connect to host github.com port xxx: Connection timed out

Symptom

Cloning into 'SOME-REPO'...
ssh: connect to host github.com port xxx: Connection timed out
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.

Where xxx can be some random port number other than 22.

Analysis

Probably you change the default ssh port at some point.

In my case, I cannot clone repos from my home server, so it might be a side effect caused by the non-standard port forwarding of ssh port from 22 to xxx.

Solution

Add following to your ~/.ssh/config

# ~/.ssh/config
Host github*
	Port 22

The above solution is originally from this post, I modified it so that it also works for GitHub enterprise.