Hello Sir, i have 300 systems inside my network, all those have web access also. Here my requirement is to block some specific web sites and also i want to log the deatils about the users who are trying to use those sites. Thank you.
Just to put this out there, you could use a free service to assist. Take a look at OpenDNS, www.OpenDNS.com. This will provide you with similar ability as variety of pay services. The downside to this, you will not be able to report on user-website use. It will though give you information about website attempts and such.
Just as an additional resource.