What is the IP Address of your computer on the Local Area Network? Is it at 192.168.0.xxx? Try setting the IP of your PC to 192.168.0.200 and the Default Gateway to 192.168.0.1 and on the Account Detail Screen set the System URL/IP to 192.168.0.251, Port 2601 and un-check the Connect Non-Secure box. Try the connection again.