Cannot use remote desktop using the companyweb on SBS2003

Hi i've recently installed an SBS2003 server for a customer with around 10 PCs all running Windows XP. The whole installation went fine and there hasn't been any major problems. I ran the Internet Connection Wizard and have told it to allow all access to the Web server. The server itself has one network card so isn't running its own firewall (on the subject of firewall there is a Sonicwall TZ170 installed with ports 25,80,443 & 3389 all forwarded to the server).

I tested Outlook web access from outside of the network and it works very well. I also tested access to the website from the internet and again no problems. The problem I'm having is this:
I can log onto remote web workplace fine, click on 'connect to client desktops', and it lists all the computers fine. But when I try and connect to the computer I get the following error:

"The client could not connect to the remote computer. Remote connections might not be enabled or the computer might be too busy to accept new connections. It is also possible the network problems are preventing your connection. Please try connecting again later. If the problem continues to occur, contact your administrator".

This also happens if I try and connect to the Server using this method. I can connect to the server using remote desktop though if i just open the program and type in the IP address of the firewall. I have also made sure that remote desktop is enable on all the workstations and that the relevant users have permission to log on via this method.

I'm assuming that the problem lies in the web server somewhere so any help would be much appreciated. Thanks.
leehewsonAsked:
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mikeleebrlaConnect With a Mentor Commented:
so let me see if i understand,, you can use terminal services from anywhere via the TS client,, but you can't use the web component from anywere at all?
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mikeleebrlaCommented:
do you have terminal services installed and enabled on the server?  Open services and see if the "Terminal Services" service is started.
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leehewsonAuthor Commented:

Terminal service is installed and is in remote administration mode. The service is up and running fine.
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mikeleebrlaCommented:
can you get to it from a machine on the same subjet in your lan?
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leehewsonAuthor Commented:
Yeah. I can use remote desktop from another PC inside the LAN or outside the network and it works fine. It just won't work through the small business server web server component.
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leehewsonAuthor Commented:
Yeah that's exactly it.
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leehewsonAuthor Commented:
Sorted it, I enabled UPnp and pointed that to the server and it sorted it. Cheers.
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