If your ProxySG appliance is configured to intercept HTTPS traffic, you may see cases where the proxy presents the exception: "Expired SSL Server Certificate" and the following default error message:
Expired SSL Server Certificate (ssl_server_cert_expired)
Your request contacted a host which presented an expired or Invalid certificate
This is typically caused by a Web Site presenting an incorrect or invalid certificate, but could be because of a configuration error.
For assistance, contact your network support team.
This can be caused by a certificate that has either expired or is not yet valid, (issued for a future date).
The problem could also be related to a Proxy time and date misconfiguration. You can check the clock and date from the Proxy's Web-Based Management Console:
or from the CLI:
10.91.22.2 - Blue Coat SG210 Series>show clock
UTC time: 2001-09-26 14:58:50+00:00UTC
Local time: 2001-09-26 14:58:50-00:00UTC
If the certificate has expired, create a new one to replace it.