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Subject: Re: Issues with OpenSSH Server
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From: Brian Inglis via Cygwin <cygwin AT cygwin DOT com>
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On 2023-08-09 08:00, Sabarigirisan S via Cygwin wrote:
> We have been using OpenSSH server for our windows environment for quite
> some time close to 4 years and starting Saturday, we noticed that there is
> some sort of weirdness where the console is not getting returned after
> completion of connection from the client.

Are your Cygwin and ssh servers allowed or supported by your sysadmins?

Could they have changed some protection settings or policies to block the 
programs or connections on Saturday?

Are your hosts running antivirus and could they have been changed or upgraded 
Saturday? See BLODA:

	https://cygwin.com/faq/faq.html#faq.using.bloda

Are your hosts running Cygwin or Windows SSH servers?
Check that they are not trying to run both, or running only Windows SSH, that 
your system and servicea startup ensures that, and did not change Saturday!

Check your firewall rules did not change Saturday to drop allowing incoming ssh 
connections or make other changes to them.

> With heavily automated infrastructure, the automation scripts are breaking
> currently.
> 
> Even from the localhost, when we open the cygwin terminal type exit, it is
> not closing the console
> 
> Tried reinstalling Cygwin but the install process hangs forever on
> ca-certificate post installation.

Try running sh -vx /etc/postinstall/ca-certificates.sh to see if and where it is 
getting stuck.
Also sh -vx /etc/postinstall/ca-certificates-letsencrypt.sh if you are allowing 
letsencrypt certs.
If you are using any additional external or internal CAs or certs, check that 
they are still installed and working.

This all assumes you are running current Cygwin and ssh packages.
In any case it is useful to follow the Cygwin problem reporting guidelines 
appended to each post below, by replying to the list with a copy of the output 
from running `cygcheck -hrsv > cygcheck-hrsv.log` on a failing system attached 
as text, with any other relevant details of your Windows systems.

-- 
Take care. Thanks, Brian Inglis              Calgary, Alberta, Canada

La perfection est atteinte                   Perfection is achieved
non pas lorsqu'il n'y a plus rien à ajouter  not when there is no more to add
mais lorsqu'il n'y a plus rien à retirer     but when there is no more to cut
                                 -- Antoine de Saint-Exupéry

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