Also, how can I access these clients remotely via the web? I set up the WWW proxy service on the Wingate server to "use Java client authentication as required by policies". How do I set up a web browser to connect via the Wingate proxy?
If the WinGate servers internal IP address is 192.168.0.1:
Internet Explorer --> Tools --> Internet Options, as shown in image below

Now when I'm in Gatekeeper on a remote PC, I can see the network behind the Wingate server, but all of the clients are listed as "Not accessible". There are no route conflicts reported. Do I need to do something special on the clients behind the Wingate server in order to make them accessible via the VPN? They all have the Wingate server listed as their default gateway in the TCPIP settings.
1. On the VPN host, on your network card facing the private LAN (Internal), do you have a default gateway set on it? In most cases you should not.
2. Can you access any of those computers showing as not accessible via a UNC path. e.g if a client computer that is shown as "Not Accessible" has the IP Address of 192.168.0.2, can you access it via (Windows) Start menu --> Run --> \\192.168.0.2
3. Do the client computers have any firewalls or security suites running on them? You may want to disable them for the sake of testing. e.g McAffe, Norton Internet Security, Zone Alarm etc...? If they have the Windows firewall on them disable it for the sake of testing as well:
On the desktop right click My Computer
Manage
Services and Applications
Services
Scroll to bottom and double click "Windows Firewall/Internet Connection Sharing (ICS)"
Set the Startup type to disabled
Press the stop button to stop the service.
4. The local participation on the host is set to local network, yes?
5. What kind of license do you have on the WinGate VPN host, a trial?
6. If you are still having issues, we can send you an updated driver which is known to fix a similar problem with the VPN behind a NAT connection. Please tell me what windows operating system are on the joiner(s) and host.