|What was the error? Have them do a tracert to your wan ip to make sure nothing else is going on.|
It would appear you have the listening port working since you an access it locally. Though you should do it local and not specify the port to see what happens.
To router forward you need;
static ip on the web server
port forward 8080/TCP to that internal static ip
then access externally as you have tried with the wan ip and port number.