title: ssh connection timed out
body: <p>I am not able to ssh in git to github or bitbucket or gitlab.<br>
  I typically have the following error message: how can I avoid it?</p>
  
  <p>========== output ============</p>
  
  <pre><code>ssh -T git@github.com -i ~/.ssh/id_rsa -v
  OpenSSH_7.2p2 Ubuntu-4ubuntu2.2, OpenSSL 1.0.2g  1 Mar 2016
  debug1: Reading configuration data /etc/ssh/ssh_config
  debug1: /etc/ssh/ssh_config line 19: Applying options for *
  debug1: Connecting to github.com [192.30.255.113] port 22.
  debug1: connect to address 192.30.255.113 port 22: Connection timed out
  debug1: Connecting to github.com [192.30.255.112] port 22.
  debug1: connect to address 192.30.255.112 port 22: Connection timed out
  ssh: connect to host github.com port 22: Connection timed out
  </code></pre>