Blocking iphiding sites

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Hi Everyone,

In my Redhat linux 9 system, I am using Squid as  proxy. Using
squidguard I used to block the unwanted sites. But some users are
still accessing the blocked sites using some
Iphiding sites(example:
Apart from blocking the ip hiding sites, is there any other way to
stop the users from accessing the blocked sites.

Is there any ports I can block ,
which is used by the iphiding sites. Any specific ports are used by

Thanks in advance

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