need to know how to block connection to proxy servers and also how to block free vpn softwares like

In my company we use cisco ASA firewall and we prevent access to some websites like facebook, youtube,...etc but some users connect to proxy servers and use free vpn software like hotspotshield and Ultrasurf to get access to blocked websites.

I need to know how to configure ASA fireware to block conection to proxy servers and also to block free vpn software taffic.

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