Im wondering if anyone can help me.

We have recently found some applications that cannot be Firewalled. Some Chat apps can tunnel SSL traffic from a users workstation, directly through our firewall, to a server on the internet.

We have also found a remote software device that transmits traffic in a similiar fashion, scary stuff!! (www.gotomypc.com)

Can this be locked down, without disabling all SSL, http (might not go down too well!) other than blocking each and every IP address of the Server on the Internet?

Any help would be appreciated.