The TiVo must be configured with the same SSID as your AP/router.

You should set it when you run nic_install.

There is a known bug that nic_install will not allow upper-case characters in the ssid. This can be addressed in one of two ways...

1) Change the SSID of your AP/router to all lower-case.

2) Download the latest CacheCARD pc driver and follow the instructions except specify airnet rather than cachecard when you run nic_install.