I just bought the Linksys WGA600N Wireless Gaming Adapter for my HR21-100. The router connected to the internet is a Linksys WRT160N. Every time I try and enter the security key in the WGA600N set up screen on the HR21, I keep getting an invalid key try again. This security key is the one I use to connect all my home computers so I am sure its correct. I disabled the security on the router and was able to connect with no problem. I really do not want to keep my network unprotected. Is there something I am not doing right?