I am having the same problem..I think. I have never used the server because I just purchased a 497 handset for my ETX and this is my first go at remote control of the scope. I went and installed all the AS/Envisage upgrades figuring what the heck.
When I try use any port from 5400-5410 or so while setting up the server, the instant I check 'listen', I get an error message telling me this port is already in use. In frustration, I try 5488. It successfully listens. OK then.
Now I go start the scope via network protocol. I enter that port and leave the default 127.0.0.1...and it connects to the scope. Great. Now I figure I'm in bidness!
So I start Envisage, enter 127.0.0.1 as shown, hit connect..and get a message that the target machine is actively refusing my connection. No matter what combo of ports or IP's I try, if I can make it through the AS portion of the setup (server start and connection), I always get this message. Driving me nuts now. I spent a good couple hours trying different combos and pulling my hair out. I don't have much to start with, so this is not good!
I don't know how to change a firewall. What do I do? Another possible factor..I am on a wireless network at home with the laptop. I am not attempting to run the scope via the wireless, the wifi is merely running in the background so can listen to streamed tunes as I scope.