192.168.1.245 is the default IP address. You may have changed it. Try: http://192.168.1.245/with the "slash" at the end. Some browsers seem to insist on it being there.
You might also be able to force a connection by assigning a static IP address. arp -s 192.168.1.245 00-00-00-00-00-00 where the mess at the end is the WAP54G MAC address.
Does the server deliver the IP address for the WAP54G? Probably not, but if it does, check the DHCP cache or log to see what IP address was assigned to the WAP54G MAC address. The MAC address is printed on the bottom of the access point.
Use nmap to scan for the IP address.
If you get too many devices, run: arp -a immediately after scanning and see which IP address was assigned to the WAP54G MAC address.