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

On Thu, Dec 15, 2005 at 06:46:02PM +0100, Florian Weimer wrote:
> > 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.

Good point.  I suspect that's more likely.


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