linux - Why is port 1111 open, and is it safe to be?

I'm new to systems administration and have a server running a website with HTTP (at port 80), HTTPS (at port 443) and SSH (at port 22).

I'm running Ubuntu 11.04.

I did an Nmap port scan using my personal laptop and other than these 3 ports, port 1111 was open too. This was the output:

1111/tcp open tcpwrapped

I then did:

sudo netstat -lntp | grep -F 1111

...and got the following output:

tcp 0 0 0.0.0.0:1111 0.0.0.0:* LISTEN 21596/monit

Monit appears to be a monitoring tool in Ubuntu.

Should I be concerned about this?

How do I determine the purpose of port 1111?

How do I close it if I need to?

Answer

According to this reference:

Because protocol TCP port 1111 was flagged as a virus (colored red) does not mean that a virus is using port 1111, but that a Trojan or Virus has used this port in the past to communicate.

So, it could be a virus/trojan.

I would recommend you to use Net Activity Viewer to determine what process/service is keeping this port on listening state:

After this, Google the process name to see if there are any viruses related to this process and to this port.

Finally, if you think it is a virus, just follow the instructions guided here.

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