Can't Access VNC via a browser.

[Tony Frost]

I'm guessing that this problem is probably caused by a setting in XP professional that is wrong but I don't know which one.
 
I have a Laptop running WinXP (Home Edition) - SP2 with IE6 and a Desktop running WinXP (Professional/Media Centre Edition)  - SP2 with IE6.
 
I have installed the latest version of Java from Sun at http://www.java.com/en/index.jsp on both machines.
 
I'm trying to get the 2 machines to talk via a router on "my" side of my gateway using the browser - previous postings in September and October detail my configuration. I'm NOT trying to connect from the Internet via my gateway therefore I don't need to "port forward" my router (yet).
 
My Desktop(192.168.1.2) is running RealVNC 4 in Service Mode with Java accepted on port 5802. I CAN access this machine from my Laptop (192.168.1.3) using IE6 with the address http://192.168.1.2:5802 .
 
The problem is that I CAN'T access my Laptop from my PC. As before I'm running RealVNC in Service Mode on my Laptop with Java accepted on port 5803 and I'm using the address http://192.168.1.3:5803 from my PC running IE6.
 
Both machines connect and talk successfully both ways using the Viewer and VNC in User Mode.
 
I can only think that there's a problem with my Desktop setting as the desktop version of the operating system is different from that of the Laptop (Professional verses Home respectively) and I may have some form of conflict in XP Professional.
 
Any thoughts folks
 
 
Tony Frost