Do you have the option ticked to start aMuleWeb on startup? Is that the way you start aMuleWeb?
The port (4711) you are trying to access is the number on the right side of "Web server port"?
Here is a link to a sceenshot of the
preferences dialog on my notebook.
After having set the options, simply restart aMule.
Now if you open up a browser on a different machine and enter the IP of the computer running the amule applications followed by the port highlighted in the first screenshot (e.g: 192.168.1.99:46772) you should get to see something similar to
this.
You could also check the aMule log and see if it tells you something about a refused external connection. My log says:
2009-11-11 17:32:50: ExternalConn.cpp(217): New external connection accepted