Gosh ... it could be lots of things these spring to my mind initially....
What error message do you get when trying to access the server via EE router?
Can you ping the server?
Where is your website hosted? Is it on a local network server or hosted on a commercial external server?
It could be that the DNS servers that your EE router is using don't have the IP address propagated to them yet. You could look at using different DNS servers to the EE defaults if you know what your doing.
Could be a firewall issue somewhere.
What router are you using for your WiFi... does it has firewall or website blocking enabled?
