Ah, i finally got it working.
"Ashley" - No i didnt have any server programs running.
But, for others that might have this problem.
I went to preferences in construct, and choose a different port.
The default port was "50000" (50.000)
I changed that to 5000 (5.000)
Which i actually allowed my firewall to grant, and a portforward in my router.
But, how about using port 1221-1222 as standard in construct?
Thats the default http port, should be open on all routers i think?
Just an idea, not sure if that port works, but it should? and people wont have this problem.
Anyways, im happy now! :- )