I am new to the world of Linux and setup Fedora Core 9 on a machine I have and everything is going well. I ran an NMAP on my IP from another machine and see a port open that I cant find anything on.

It's listed as 36991/tcp open unknown, I went into etc/services and that doesnt even list the Port nor any services associated with it. Anyone know what this is for, how to disable it and whether I should be concerned?

I can telnet to my IP from another machine on that port but I get a blank box cant type or get it to do anything so something's listening on it.

Here's my netstat from the machine as well:

netstat -lptu
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 *:ssh *:* LISTEN 6404/sshd
tcp 0 0 localhost.localdomain:ipp *:* LISTEN 2084/cupsd
tcp 0 0 localhost.localdomain:smtp *:* LISTEN 2025/sendmail: acce
tcp 0 0 *:36991 *:* LISTEN 1699/rpc.statd
tcp 0 0 *:vnc-server *:* LISTEN 2421/vino-server
tcp 0 0 *:ssh *:* LISTEN 6404/sshd
udp 0 0 *:659 *:* 1699/rpc.statd
udp 0 0 *:42165 *:* 1699/rpc.statd
udp 0 0 *:bootpc *:* 2717/dhclient
udp 0 0 *:mdns *:* 2075/avahi-daemon:
udp 0 0 *:ipp *:* 2084/cupsd
udp 0 0 c-xx-xxx-xx-xx.hsd1:ntp *:* 2004/ntpd
udp 0 0 localhost.localdomain:ntp *:* 2004/ntpd
udp 0 0 *:ntp *:* 2004/ntpd
udp 0 0 *:54654 *:* 2075/avahi-daemon:
udp 0 0 fe80::212:3fff:fe42:ntp *:* 2004/ntpd
udp 0 0 localhost6.localdomain6:ntp *:* 2004/ntpd
udp 0 0 *:ntp *:* 2004/ntpd

Any help would be greatly appreciated!

Thanks!

the port number is assigned by portmap, i.e. it's not a special number, just an arbitrary ephemeral port that is picked and remembered for its lifetime. it's for the rpc.statd service which is used for status notifications for NFS. I believe that every NFS connection will require a new instance of the statd service. http://linux.about.com/library/cmd/b..._rpc.statd.htm