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 Command Line Interface (CLI) commands in enable mode to clear the certificate cache on the ProxySG appliance:
Enter configuration commands, one per line. End with CTRL-Z.
clear-certificate-cache is actually a hidden command, so there is no help content displayed for it; however, an ok message should show after executing the command.
Confirm that the cache has been cleared by going to the following URL: