The default IP addresses are as follows:
LAN 1 - 192.168.42.1
WAN / LAN 2 - 192.168.43.1
Please ensure your computer's IP address is in the same address range (192.168.42.x) as the IP Office system.
If DHCP is enabled on the LAN 1 port then your computer can use DHCP settings to obtain an IP address to automatically connect to the IP Office system via the Manager application.