On the impossibility to use escape sequences when the networks hangs

[Theo de Raadt]

>  |Use [enter]~. to terminate a stuck ssh connection.
> 
> But this only works at the beginning of a line.
> Only then the client turns this mechanism "hot".


Your interpretation of the situation is quite incorrect.

The two-character sequence <enter>~ is seen by the client, and it
looks for the next character.  A good character to use is ?

I think you've chosen to not understand.