Issues with check_by_ssh

[Matthias Kellermann]

Hello list,

tonight I got lots of false-positive messages from Nagios. All these
messages came from services checked with check_by_ssh. Strange thing is
that SSH was running on all servers and there were no problems with the
network connectivity. All other services on these servers had no errors.
After 20 minutes or so check_by_ssh worked fine again.

I've got no errors in the logs (i.e. auth.log) - whether on the Nagios
server nor on the servers to be monitored. The only error I got from
check_by_ssh is:

Plugin timed out while executing system call

While this is not very meaningful I'm trying to use check_by_ssh with a
higher timeout. I also wonder about the following check_by_ssh option:

-f	tells ssh to fork rather than create a tty

What does this option mean? Is it possible to log the exact output from
check_by_ssh to a logfile? Did anyone have similar false-positives with
check_by_ssh?

Best regards,
Matthias

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