[CentOS] Strange TCP ports phenomena

Wed Aug 17 20:29:37 UTC 2005
Scot L. Harris <webid at cfl.rr.com>

On Wed, 2005-08-17 at 16:23, Dominik Składanowski wrote:
> >>>Sounds like exactly what you're seeing, I know our watchguard firebox proxies FTP connections so it looks like every box has FTP installed even if they don't.
> > 
> > 
> >>>Do you have a router/firewall in front of your server?  If you are using
> >>>something like http://www.grc.com to scan from the Internet you are
> >>>probably getting a response from the router/firewall in front of your
> >>>server not from the server itself.
> > 
> > 
> > 
> >>Few days ago I had another server on the same IP (it's IP for tests
> >>before production place), which was FTP server. So maybe that's a reason?
> > 
> > 
> > If the current server does not have those ports open they should show as
> > closed or stealthed.  I believe that you have a device providing NAT in
> > front of your machine and it has that port open for some reason.  
> > 
> > Is that at an ISP or a home network?  
> 
> There is no any NAT in the front of this machine. Besides it has public IP.

What does netstat -l show?