Shibboleth SP - Service Temporarily Unavailable error

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Shibboleth SP - Service Temporarily Unavailable error

Hi All,

We are new to the Shibboleth SSO. We implemented the SSO with below servers.

1. Shibboleth SP
2. CA siteminder IDP
3. Apache2.4
4. Tomcat7
5. Mod_proxy_ajp

Everything is working fine but sometimes we are getting the below error. If we Refresh the browser it is working.
Service Temporarily Unavailable" "The server is temporarily unable to service your request due to maintenance downtime or capacity problems.

Below are the error from apache:  
   [proxy_ajp:error] [pid 7116:tid 1100] (70007)The timeout specified has expired: [client] AH00878: read response failed from

Note :
a. is IP of the tomcat server
b. No logs in Tomcat
 My session attribute:

Session Expiration (barring inactivity): 22 minute(s)
Client Address:
SSO Protocol: urn:oasis:names:tc:SAML:2.0:protocol
Identity Provider: menlo_Idp_Prod
Authentication Time: 2016-11-07T14:55:28Z
Authentication Context Class: urn:oasis:names:tc:SAML:2.0:ac:classes:Password
Authentication Context Decl: (none)

SAML-firstName: ch
SAML-lastName: aravind

What could be the reason and any hints to troubleshoot further.