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   PID: SoupGate-Win32 v1.05   
   bob prohaska  wrote:   
   > Where does RasPiOS put log files related to ssh connections?   
   >   
   > I've got a Pi4 that's dropping individual ssh connections. One   
   > particular connection out of a dozen or so drops, so it's   
   > probably related to the server end, not the client.   
   >   
   > It'd be helpful to examine the client log for clues, but   
   > the logging setup on RasPiOS is very different from   
   > BSD and and I'm unsure where to look.   
   >   
   > The only message displayed on LxTerminal at the RasPiOS end is   
   >   
   > .....   
   > client_loop: send disconnect: Broken pipe   
   > .....   
   >   
   > Thanks for reading, and any guidance!   
      
   It's normally in /var/log/auth.log, but that's for the setup part of SSH   
   where it does authentication.  Otherwise in general syslog, as accessed via   
   'journalctl'.  You can increase the amount of debug logging in   
   /etc/ssh/sshd_config   
      
   But usually a broken pipe means the TCP socket dropped for some reason,   
   which is not the fault of SSH.  It can be due to aggressive timeouts on NAT   
   routers - mobile networks are notorious for that.  Search for 'ssh   
   keepalive' for details of how to make SSH send null packets back and forth   
   every so often to prevent timeouts.   
      
   It could also be wifi related, if the wifi dropped out for some while then   
   eventually the TCP connection would drop.   
      
   If you affected by TCP drops, 'mosh' is a tool that runs on top of SSH that   
   automatically reconnects and maintains the connection as it was before.  It   
   also does things like caching keystrokes and replaying them when the   
   connection comes back up.   
      
   Theo   
      
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