keepalive message not sent?

[Matt Johnston]

Hi,

Could you try running "strace -p <dbclient_pid>" on the
dbclient process when it's running under the wrapper, soon
after it starts? That might give a clue as to how it
differs.

Cheers,
Matt

On Mon, Aug 16, 2010 at 12:54:30PM +0200, Fabrizio Bertocci wrote:
> Hi All,
> Here is an interesting (but inconvenient) problem I've found with dbclient
> when connected to an OpenSSH server that uses the keepalive
> (ClientAliveInterval & ClientAliveCountMax).
> 
> I have a OpenSSH server that sends keepalive messages to the client every 10
> seconds and consider the client disconnected after 2 failed attempts.
> 
> On my client I use dbclient (latest version 0.52) to start a connection
> (using a private key with no password) to setup some tunnels (local &
> remote).
> So far so good. When I launch the dbclient from a shell everything is fine,
> this is what I see on the server log every 10 seconds:
> 
> debug2: channel 1: request keepalive at openssh.com confirm 1
> debug1: Got 100/10 for keepalive
> debug2: channel 1: request keepalive at openssh.com confirm 1
> debug1: Got 100/11 for keepalive
> ...
> and the server keep maintaining the connection with the client.
> 
> Unfortunately, when I invoke my bourne shell script (that I use as wrapper
> for launching dbclient) from the init script (/etc/init.d/myWrapper.sh),
> everything SEEMS to work fine, but when the server sends keep alive
> messages, the dbclient doesn't seem to respond correctly.
> This is what I see from the server's log:
> 
> debug2: channel 1: request keepalive at openssh.com confirm 1
> debug2: channel 1: almost dead
> debug2: channel 1: gc: notify user
> debug1: session_by_channel: session 0 channel 1
> debug1: session_close_by_channel: channel 1 child 18881
> debug1: session_close_by_channel: channel 1: has child
> ...
> Disconnecting: Timeout, your session not responding.
> debug1: do_cleanup
> debug1: do_cleanup
> 
> Does anybody have an idea why ?
> It has something to do with I/O probably or some settings that are available
> when I launch my script (or the dbclient) from an interactive session but is
> missing when is invoked from the init script...
> 
> Regards,
> fabrizio