Re: closing unwanted ports - and what is 1720/tcp filtered H.323/Q.931

To: Noah Meyerhans <noahm@debian.org>
Cc: kevin bailey <kbailey@freewayprojects.com>, debian-security@lists.debian.org
Subject: Re: closing unwanted ports - and what is 1720/tcp filtered H.323/Q.931
From: Florian Weimer <fw@deneb.enyo.de>
Date: Thu, 15 Dec 2005 18:46:02 +0100
Message-id: <[🔎] 87irtqs17p.fsf@mid.deneb.enyo.de>
In-reply-to: <[🔎] 20051215170144.GR19881@morgul.net> (Noah Meyerhans's message of "Thu, 15 Dec 2005 12:01:44 -0500")
References: <[🔎] dnrntt$dtr$1$8302bc10@news.demon.co.uk> <[🔎] 20051215170144.GR19881@morgul.net>

* Noah Meyerhans:

>> what is 
>> 1720/tcp filtered H.323/Q.931
>> ?
>> 
>> and how do i turn it off if it is uneccessary.
>
> It may be nothing.  The fact that it showed up as filterd in the nmap
> output indicates that nmap didn't received a TCP RST packet back when it
> tried to contact that port.  That may mean you have iptables configured
> to DROP packets to that port.

It could also mean that the the ISP filters 1720/TCP, in order to
prevent its customers from using VoIP.

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  - From: kevin bailey <kbailey@freewayprojects.com>
- Re: closing unwanted ports - and what is 1720/tcp filtered H.323/Q.931
  - From: Noah Meyerhans <noahm@debian.org>

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