Re: Tramp timeout for currently unreachable connections?

[Visuwesh <visuweshm@gmail.com>]

[வியாழன் செப்டம்பர் 12, 2024] Michael Albinus wrote:

> Robert Pluim <rpluim@gmail.com> writes:
>
> Hi Robert,
>
>>>>>>> On Thu, 12 Sep 2024 16:47:39 +0200, Michael Albinus <michael.albinus@gmx.de> said:
>>
>>     Michael> Visuwesh <visuweshm@gmail.com> writes:
>>     >> Hello all,
>>
>>     Michael> Hi Visuwesh,
>>
>>     >> I know that non-essential=t prevents Tramp from establishing new
>>     >> connections but is there a way to make Tramp use a very short timeout
>>     >> when trying to connect to a previously established connection that is
>>     >> now unreachable?  What I mean is: if I am connected to a remote host via
>>     >> a ssh connection /ssh:user@remote: and my internet connection goes down,
>>     >> I do not want Tramp trying to fetch remote resources forever.
>>
>>     Michael> Use 'M-x tramp-cleanup-connection'. Play with user option `tramp-connection-timeout'.
>>
>> Idle thought: would enabling 'ServerAliveInterval' help at all here?
>> (my Tramp connections travel from one side of my desk to the other, so
>> I canʼt tell ☺️)
>
> Yes, even the Tramp manual speaks about:
>
> 4.19.2 Detection of session hangouts
> ------------------------------------
>
> ‘ssh’ sessions on the local host hang when the network is down.  TRAMP
> cannot safely detect such hangs.  OpenSSH can be configured to kill
> such hangs with the following settings in ‘~/.ssh/config’:
>
>      Host *
>           ServerAliveInterval 5
>           ServerAliveCountMax 2
>
> But who reads manuals ...

Ahh!! It seems I completely misunderstood these two variables in my
initial reading of ssh_config(5) when I was initially reading through
the Tramp manual.  Thank you for pointing this out again.

>> Robert
>
> Best regards, Michael.