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i recently joined up the sysdept in my workplace. firewall here uses a mix of squid and iptables to block/accept certain kind of traffics and/or give access to some user to access certain sites or use messengers. i have found out an interesting thing going on here but. some users with no priveleges to access hotmail and msn msgr are still using it and i have no clue as to how they are doing this. we have blocked the dport of restricted sites for all the users except some and they shouldn't have access to them. still i can't figure it out. can somebody guide me as to how they are doing it and what can i do to block them permanently? the reason for blocking such sites are unknown to me so only the management knows.
Could they be using their own proxy servers? An anonymizer? You need to look at their traffic logs.
Slightly harsh but you could just boot them from the network for irregular use and make them tell you what they did when they come to complain. If they signed an agreement to not bypass security restrictions and they are doing that, you have every right to boot them.
i think this is it. i am checking my access.log files for any occurences of the sites that i have collected through visiting sites provided by gr3p. i will write back if i find something interesting...
i found out an unusual site -unipeak.com which provides webproxy service to anomously surf the web. there are hundreds of similar sites in the web like proxyweb.net,rajorthought.com etc.. that provide this kind of service. anyway i got to the core of it. thanx everybody.