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SecurityPortal: Ask Buffy - Blocking Internet Access, Apache Proxy Request

May 13, 2001, 12:00 (0 Talkback[s])
(Other stories by Buffy Overflow)

Questions this week cover SSL FTP in Internet Explorer; Blocking Internet Access; Apache Proxy Request; Hardening NT/2000 & HP Unix; Firewalls and ICS; MS Proxy:

  • "I am an ISP administrator and have several dial-up and 24 hour online wireless LAN clients.

    I would like to block certain users (dialup & LAN) from accessing the Internet but they should be able to send and receive their mail only.

    How do I setup my server to do this? I am using Linux Redhat 6.2 kernel 2.2.x

  • I noticed in my Apache log that some bad guys were directing requests thru my server - to save themselves bandwidth I guess. For example, they would send a "GET http://www.somesite.com/blah/blah.hmtl" request.

    The "404" in there says I am denying the request but they keep at it. Maybe because I was loosely configured I got on a some kind of list. Of course, it takes bandwidth to deny these requests. I tried denying based on incomming IP (with ipchains) but the users seem to be generic webserfers who could be anywhere so that isn't practical."

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