hi everybody,

i work for a small company(10 linux server and 20win2k clients) and the internal network is protected with a firewall.today i scanned this host and i got these:

starting nmap V. 3.00 ( www.insecure.org/nmap/ )
> (The 1596 ports scanned but not shown below are in state: closed)
> Port State Service
> 22/tcp filtered ssh
> 23/tcp filtered telnet
> 24/tcp filtered priv-mail
> 25/tcp filtered smtp
> 1234/tcp open hotline
> Remote operating system guess: Linux 2.1.19 - 2.2.20

i was wondering about the 1234 port.
i found out that the ultor trojaner uses this port.
i'm not sure about that is it a big problem or not??
any help or recommendations are appreciate ,
cheers,
dieterle81