This is probably a stupid question, but is the router plugged into the roboRIO? If you can tether fine but can't find the roboRIO when you're not tethered, the RIO and router may not be communicating.
This is my complete list of things to try that I think will fix the problem if done.
- Re image the roboRIO
- Re download java to the roboRIO
- Re image the router
- Make sure that your firewall is disabled (or allows the connection)
- Click on the wifi icon in the bottom right of your screen, click "Network Settings" > "Change adapter options" > Right click on wireless connection > Properties > IPv4 > Properties > Make sure that your IP and DNS server are both obtained automatically.
- Double check that the roboRIO is plugged in to the router via ethernet (It sounds silly but double check)
Good luck!
-Tyler