Clients / hosts may receive an expired SSL certificate warning when the SSL Forward Proxy fails to purge expired SSL certificates from the cache
Enter the following CLI commands to clear the certificate cache on the ProxySG appliance.
Enter configuration commands, one per line. End with CTRL-Z.
The clear-certificate-cache is actually a hidden command so you won't be able to get help on the command, you will however see an OK message after executing the command.
You can confirm that the cache has been cleared by going to the following URL