Check not running

[Mike Chesnut]

I have a check that never runs.  The services I've defined that use it 
sit at the top of the scheduling queue, with their next check always 
within a few minutes of the last time I restarted nagios.  This remains 
the case even if I reschedule their next check time in the web interface 
(while I see a line in the log file confirming that I rescheduled it, 
the "next check" does not update and the check is never run).

The check is defined like this:

command_line   /etc/nagios/plugins/check_snmp_byportname.pl --host 
$HOSTADDRESS$ --community mycommunity --port $ARG1$

What's really weird is that if I change it to use Wolfgang Wagner's 
capture_plugin.pl*, then everything works as expected.  I change the 
above to this:

command_line    /etc/nagios/plugins/capture_plugin.pl 
/etc/nagios/plugins/check_snmp_byportname.pl --host $HOSTADDRESS$ 
--community mycommunity --port $ARG1$

and then I am able to see the output in /tmp/camptured-plugins.log, the 
status updates in nagios, these checks get cycled through the scheduler 
queue normally, and everything is as it should be.

check_snmp_byportname.pl is a script I've written that's essentially 
just a wrapper around the stock check_snmp.  It works on its own (from 
the command line) as expected, and works when called with 
capture_plugin.pl as a wrapper.

If I then remove the capture_plugin.pl part of that command definition 
and restart (and this is the *only* change I'm making), then this 
particular check goes back to not working (while everything else 
continues to work as normal).

This is on Nagios 2.9 (I'm using the rpm provided by Dag Wieers, on 
CentOS 5.2).

What else can I do to debug this?  I thought that using capture_plugin 
would show me what was wrong with this check, but instead it just showed 
me that nothing is wrong, apparently.  I'm kind of confused at this point.

Sorry this is so long.  I wanted to try to include as much information 
and observations as possible.

Thanks in advance for the help,
Mike

* - from here: http://www.waggy.at/nagios/capture_plugin.htm

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