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I have just installed Squid3 on my server and trying to block the Skype messenger. Still no luck. I tried to add the rules in Squid wiki (http://wiki.squid-cache.org/ConfigExamples/Chat/Skype) to the end of the squid.conf :

# Skype

 acl numeric_IPs dstdom_regex ^(([0-9]+\.[0-9]+\.[0-9]+\.[0-9]+)|(\[([0-9af]+)?:([0-9af:]+)?:([0-9af]+)?\])):443
 acl Skype_UA browser ^skype

 http_access deny numeric_IPS
 http_access deny Skype_UA

 acl validUserAgent browser \S+
 http_access deny !validUserAgent

But none works. How to block Skype? Please help

share|improve this question
I suggest you sniff some Skype traffic with filddler2 to find out what it looks like. Skype and similar tend to change their signature over time to evade proxy filters. –  Petter Jan 6 '13 at 9:33
I think skype is one of the messagers which traffic cannot be sniffed/blocked that way... –  Str82DHeaD Jan 28 '13 at 11:32
Just to be sure, check if these rules are applied. If it is a matching rule with allow before them in squid.conf they will not be applied. –  Laurentiu Roescu Jan 28 '13 at 11:51
Did you see serverfault.com/questions/127605 –  Iain Jan 29 '13 at 10:00

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