Please post the message regarding the tcp/ip, It will help us solve your problem. Another solution is to enter a static ip address and dns if your router/modem dhcp service is not working. IP address, DNS,gateway and subnet mask information can be found on your husband's pc ( My husband's MAC desktop is also connected by cable to this device and works just fine.) IP address is in this format 192.168.1.? replace the question mark w/ the number between 2 - 254. Just be careful not to duplicate the ip address of your husband's MAC desktop