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.
See this AskUbuntu item on this bug /askubuntu. com/questions/ 1229456/ ssh-fails- with-connection -timed- out-in- vpn-and- hangs-here- expecting- ssh2-msg
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I resolved this with the suggested setting: =ecdh-sha2- nistp521 to the command line args for one time use.
> 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