Now this is strange.
I made a faulty rule on port 80 = cannot get anywhere.
Reset the FW, created the pool for the loadbalancer, made a rule for the balancer.
Now RDP, ping and so on works!
Funny, I set a rule for a network webcam. (portforward)
But when typing the WAN ip (or opt1-4) i only get to the pfsense-router.