Hi,

Did you check error log or syslog? Is that spitting out any errors? Do you have SSL_OCSP settings configured and it might not be able to reach to the protocol?

I mean I had 45 portals and was facing a same issue. Later when I done the debug I found that ocsp.godaddy.com was not reachable and it verifies every time we reload the service.

Just a heads up though.