I've been fighting with this for a while. I have a firewall on our Netopia router. I have blocked port 110 for incomming and outgoing connections, also I have NAT enabled on this router and I am not translating port 110 to anything.
Still when I run a port scan I show that port 110 is open, but when I telnet the port it opens a connection but is just a blank screen.
I am afraid that it is a trojan horse, but I do not know how to find out what machine on our network has it. Any suggestions will be greatly appreciated.