clamav socket check times out

[Alex]

Hi,

I have an fc17 box with nagios-3.4.4 and using the clamd plugin, among
others, to check on my systems. For some reason the clamd plugin very
frequently times out when run through nrpe:

command[check_procs_clamd]=/usr/lib64/nagios/plugins/check_clamd -H
/var/spool/amavisd/clamd.sock -t 15

Even with a timeout period of 15s, it still very frequently reports
the following:

[1367955948] SERVICE ALERT:
mail01;PROCS-clamd;CRITICAL;SOFT;1;CRITICAL - Socket timeout after 15
seconds
[1367955958] SERVICE ALERT: mail01;PROCS-clamd;OK;SOFT;2;CLAMD OK -
3.568 second response time on socket /var/spool/amavisd/clamd.sock
[PONG]

This occurs on multiple servers, not just this mail01 system, and even
when the system is idle. The plugin comes from the package
nagios-plugins-tcp-1.4.16-5.fc17.x86_64 and I'm using clamav-0.97.7.

What is the procedure the check_clamd process uses to query the socket?

What could be the reason for this timeout occurring so frequently?
Could it be an issue with the maximum number of connections for clamd?

Any time I run the command manually, it succeeds, and comes back instantly.

Thanks for any ideas,
Alex

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