Full Disclosure mailing list archives
Re: Proxies
From: "Charles E. Hill" <chill () herber-hill com>
Date: Fri, 31 Oct 2003 10:35:41 -0800
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 You can never get around it, as you're aware -- proxies on ports 80, 20, 21, 22 or something else really common will always be available. However, since you need to show due diligence, you can do the following. 1. Have the administration set a policy with some teeth. "If you avoid the proxy, your account gets suspended" or some such. 2. And I'm not sure how easy this will be... restrict protocols to their known ports. Configure your firewall to only allow HTTP traffic through Port 80, and not other ports. FTP only through 20 & 21. SSH only through22, etc. Don't allow HTTP headers through any other port. On Friday 31 October 2003 09:20, Earl Keyser wrote: - -- Charles E. Hill Technical Director Herber-Hill LLC http://www.herber-hill.com/
Help needed, please. We use all cisco networking gear. Currently using a cisco cache engine with SmartFilter to "manage" the surfing for our staff/students. As usual, the little devils figured a way to get around it. They went to Google, entered "open proxy list" and bingo-bango. From this list they found open proxies to use in IE. Besides suspending them, we made one technological change. Outgoing ports 8000, 8080, 8888 and 3128 are now blocked at the firewall. Can anyone suggest further refinements to reduce this kind of abuse? I know some proxies run on port 80, but I'll have to live with that. TIA Earl Earl Keyser, Network Specialist Wayzata Public Schools 763-745-5105 "Unix IS user-friendly. It's just picky about who its friends are." This outbound message has been scanned for viruses by ISD#284. _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.netsys.com/full-disclosure-charter.html
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Current thread:
- Proxies Earl Keyser (Oct 31)
- Re: Proxies Jan Meijer (Oct 31)
- Re: Proxies Ben Nelson (Oct 31)
- Re: Proxies Gary E. Miller (Oct 31)
- Re: Proxies nosp (Oct 31)
- Re: Proxies Charles E. Hill (Oct 31)
- Re: Proxies Valdis . Kletnieks (Oct 31)
- Re: Proxies Ben Nelson (Oct 31)
- Re: Proxies Richard Spiers (Oct 31)
- RE: Proxies adam.richards (Oct 31)
- Re: Proxies Ben Nelson (Oct 31)
- Re: Proxies Richard Spiers (Oct 31)
- Re: Proxies Jakob Lell (Oct 31)
- <Possible follow-ups>
- RE: Proxies Bassett, Mark (Oct 31)
- RE: Proxies S G Masood (Oct 31)