mailing list archives
Re: Blocking port 135?
From: Justin Shore <listuser () numbnuts net>
Date: Sun, 3 Aug 2003 18:17:26 -0500 (CDT)
On Fri, 1 Aug 2003, Crist Clark wrote:
And for this crowd, I should point out that blocking 135/udp blocks
DCE-RPC which is used rather heavily by HP OpenView by default.
You may hear some shrieks of pain should you chose to block 135/udp.
I bidirectionally blocked all NetBIOS ports (tcp and udp) a long time back
and have yet to have any problems. In fact I have blocked every single
port that's unique to a Microsoft product including the MS SQL ports. I
haven't seen any downside to doing that. I also block all Apple AFP ports
for the same reasons. For that matter SunRPC is also blocked. Basically
I weeded out all the ports that have major security issues and no valid
use for my users. Now I'm not a backbone provider but for my many users
we have experienced no problems and have avoided numerous security issues
because of it. A little preventative maintenance can go a long way.
RE: Blocking port 135? Bob German (Aug 01)
Re: Blocking port 135? Crist Clark (Aug 01)
- Re: Blocking port 135?, (continued)
Re: Blocking port 135? Jared Mauch (Aug 01)
Re: Blocking port 135? Stephen Sprunk (Aug 01)
RE: Blocking port 135? Chris Johnston (Aug 02)
Re: Blocking port 135? Mans Nilsson (Aug 02)
Re: Blocking port 135? Valdis . Kletnieks (Aug 04)
RE: Blocking port 135? Drew Weaver (Aug 02)
- Re: Blocking port 135? Justin Shore (Aug 03)