Thank you for your post!
It looks like there is some communication issue. WebDirect works on Ports 80/443 by default. You could be looking at latency between the connecting computer and the Server. Can you connect to the FileMaker Server Sample File?
Also, I am going to move this thread from the FileMaker Community Feedback Space, which is specifically for input on the Community itself, to the Discussions Space where you should receive more views and potentially more advice!