How can we block Skype and Teamviewer?

The Skype rules in Anti-Chat and Teamviewer rules in Policy under Content Filter menu.
And, it's possible to add the skype and teamviewer domains to the webfilter blacklist.
The protector will find and block all the IPs of the blacklisted domains. For example, skype uses 16 DNS entries from dsn0.d.skype.net to dsn16.dsn.skype.net.

Please click menu Web filter - setup, then click on Black list for the default filter. There they can add domains. There are 2 videos in the page.