Blocking the messages containing the words Job

Discussion in 'Server Security' started by Aneesh, Nov 6, 2004.

  1. Aneesh

    Aneesh Guest

    I need to know more about Firewall. What my requirement is i need to block
    Yahoo chat, and to deny the messages which contains the words "Job"
    "Opportunities" etc to my workstations, from all the free mail servers.
    I'll describe my Network here

    1. Got one DC server named xyz with IP, which indeed is the DNS
    2. Got one Router with ip
    3. In the workstations i've configured the PRIMARY DNS as

    How can i do this with a firewall. Also need to track the chat scripts.
    I am very new to Windows 2000.
    Thanking in advance
    Aneesh, Nov 6, 2004
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  2. I don't believe there is a way to monitor emails from web mail servers. If
    there is it would probably be a pretty expensive firewall/appliance. You can
    configure a firewall to block access to chat programs, etc if it can manage
    outbound traffic. You shoud start with a default block all outbound rule and
    then add the exceptions for authorized ports/IP addresses/protocols such as
    ports 80/443 TCP for web browsing, 53 UDP for dns, 110/25 TCP for mail, 119
    TCP for newsfroups, 20/21 for FTP, etc. Many firewalls also have "url"
    filtering to block users from accessing certain websites but if you use that
    be sure to test as it may be possible to bypass url filtering if the user
    enters the IP address of a website in the address bar. You can also add deny
    rules for specific websites by entering their IP addresses, though many
    websites may have several IP addresses. Also consider an computer user
    policy that states what the users can and can not do on the internet with
    stated consequences.---- Steve
    Steven L Umbach, Nov 7, 2004
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