Have you tried a port test on the TiVo?

Messages & Settings > Settings > Network > View network diagnostics. Does the Port configuration test show succeeded?

Unfortunately it is not 100% reliable it may pass when all ports are not open. But if it fails at least it narrows down your problem.

check your router and PC, the ports that TiVo uses are.

* TCP port 37
* TCP port 443
* TCP port 2190
* TCP port 4430
* TCP port 7287
* TCP port 7288
* TCP port 8000
* TCP ports 8080-8089
* TCP port 8101
* TCP port 8102
* TCP port 8200
* UDP port 37
* UDP port 123
* UDP port 2190

Peter.