Production - Service not available message (intermittent)

[lalithj]

Hi,

We started getting some help desk calls on our IdP (Shibboleth) service
while accessing some SPs (by research staff).

The users are complaning that they are getting intermittent
503 error experienced on
https://outshibIdP.com/idp/profile/SAML2/Redirect/SSO

(Service Temporarily Unavailable" "The server is temporarily unable to
service your request due to maintenance downtime or capacity problems)

I checked idp-process.log but could not find any error at that time

However it looks like some sort of timeout issue as I can see below in
apache error log sharp at times the users are complained about (we got ajp
configured between apache and tomcat)

[Thu May 02 15:27:12 2013] [error] (70007)The timeout specified has expired:
ajp_ilink_receive() can't receive header


It looks intermittent, it does not fail all the time,

What could be the reason and any hints to troubleshoot further, I can
increase the timeout abut would like to know why it timesout


Thanks












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