For some reason, joinuo shows is offline. Is there some other port I need to open or rule on the firewall that needs to be set? Please advise. Thanks!

JoinUO connects on port 2593 like a normal client from ip: 64.34.181.151
Make sure it's not firewalled within RunUO. This isn't uncommon for people to do when they see the connections coming in and d/cing in the console.

Have you made any modification to /Scripts/Engines/RemoteAdmin?
If so, grab the latest files from the RunUO SVN.