This article address the issue when you want to connect to a server or client machine through the RWW and you get a VBScript: Disconnect error telling you that you can't connect.
Verify that TCP 4125 isn't being used by another process:From a command prompt type in "netstat -aon | find "4125"Make sure that nothing is found. If something is found find that processand see if you need it to be running on 4125.
This step will tell us if the end to end connection to port 4125 can be made from the client to the SBS server.Go to http://isatools.org and download winsocktool.msiInstall it on the SBS serverLaunch the winsocktoolConfigure the tool for: Mode: Server Protocol: TCP Local address: 0.0.0.0 Local port: 4125Click ListenOn your external client open a command prompttype telnet <external ip> 4125Verify that the telnet session connected by typing some thing. You shouldsee it on the winsocktool console.
See KB article 828053 for connectivity issue when your client is behind an ISA firewall.