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Subject:	Re: sshd
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From:	Mark Geisert <mark AT maxrnd DOT com>
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Date:	Sat, 12 Feb 2022 21:29:39 -0800
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Ernie Rael wrote:
> Hi all,
> 
> I set up cygwin several years ago and have only had one system at home. I've 
> recently got a 2nd, linux.
> 
> I've used ssh locally under cygwin, primarily to get a term for a use with admin 
> priv. And I can ssh from cygwin to the linux machine. On cygwin I see
> 
>     $ ps -ef |grep sshd
>     cyg_serv     255     254 ?          Feb  1 /usr/sbin/sshd
> 
> But ssh from linux to cygwin hangs (finally times out). Ping works linux --> windows.
> 
> I must have run ssh-host-config way back when. Can I just run it again?
> 
> Suggestions for something else to try and/or triage the problem?

You might try the following.  Determine the Windows pid of your sshd process, then 
use netstat to see if that process is listening on the sshd port.  Here's what a 
successful check looks like:

~ ps -as|grep sshd
   42834 ?          Jan 16 /usr/sbin/sshd

~ ps -lp 42834
       PID    PPID    PGID     WINPID   TTY         UID    STIME COMMAND
     42834   42832   42834       5972  ?         197612   Jan 16 /usr/sbin/sshd

~ netstat -ao|grep 5972
   TCP    0.0.0.0:22             zotac:0                LISTENING       5972
   TCP    [::]:22                zotac:0                LISTENING       5972

If the two output lines aren't there, I'd suspect a Windows firewall has TCP port 
22 walled off.  ("zotac" is my machine name; you'll see something different there.)
HTH,

..mark

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