Help with HTTPS filtering and skype

Hi folks.

I'm in bad situation right now, my boss asked me to block certain web pages / resources in our (small) office.

For that we bought kerio control firewall, but here's the problem : if i don't enable https filtering on kerio control i can't block https web pages (FB, youtube, etc.) but if i do enable filtering then skype breaks down (can't send messages and if you log out you can't log back in anymore).

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So one solution i was thinking about is to exclude skype server addresses from filtering but i can't find any reliable list of skype servers online.

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Is there any other solution or maybe someone knows legit list of skype ip addresses and/or domain names?

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Any help if appreciated.