Using Twx + Zoc,

what does it mean when I see on my Zoc screen (while in game)

"connection lost from 237.185.xxx.xxx" ??

The only other time Ive seen this is when Ive allowed someone else to sync up with my Twx session with the "Accept external connections" checked.

Of course this was not checked and I firewall was up and running.

Unless you can get a specific nslookup on the IP address, it's probably just a multicast assignment.

Linky:
http://en.wikipedia.org/wiki/Multicast_address

What port do you run twxproxy on and what other things were you running?

Nothing else was running.
I was running TWX on port 23.
I was testing Win 7 and TWX. Usually I dont use port 23 for TWX.

So something in windows 7 is sending a multicast to port 23. Either that or someone is just port surfing, depending on the specific IP that was used.

I wouldn't worry about it.