Hi ,
MSN can be blocked using 1863 port but it can still use http tunnelling
and work its way.
So block it using destination domain in squid.conf as:-

  acl msnmsg url_regex
  ^http://gateway\.messenger\.hotmail\.com/gateway/gateway\.dll

  acl msnmsg url_regex
  ^http://64\.4\.[^/]*/gateway/gateway\.dll

  http_access deny msnmsg

not sure of yahoo.

Regards,
Vijaya

"Mujeeb Rahman.Y" wrote:

> Hi
>
> Please let me know how we can allow Yahoo /MSN
> messengers access only from perticular ip address from
> our LAN If we using iptables & squid for firewall and
> proxy setup respectively
>
> Thanks
> Mujeeb
>
>
>
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