See this AskUbuntu item on this bug
https://askubuntu.com/questions/1229456/ssh-fails-with-connection-timed-out-in-vpn-and-hangs-here-expecting-ssh2-msg

I resolved this with the suggested setting:
> As a temporary workaround, setting the KEX algorithm manually solves this 
> problem for me.
> Add KexAlgorithms ecdh-sha2-nistp521 to the corresponding SSH config, or add 
> -oKexAlgorithms=ecdh-sha2-nistp521 to the command line args for one time use.

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https://bugs.launchpad.net/bugs/1874257

Title:
  SSH fails with connection timed out - in VPN and hangs here "expecting
  SSH2_MSG_KEX_ECDH_REPLY" + Ubuntu 16.04.6 LTS

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