How to block Skype with Squid

Create access list in /etc/squid/squid.com

# Block Skype
acl skype url_regex ^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+
acl connect method CONNECT

Before line "http_access deny all" in squid.conf add below records

# SKYPE BLOCK
http_access deny connect skype all

If  you  have complete all preview steps reload or restart squid.