Here is the log of him connecting to my default unmodded blockland server without RTB:
Console trace is on.
Got Connect challenge Request from IP:58.182.240.121:49189
Got Connect Request
Entering GameConnection::onConnectRequest(4233, IP:58.182.240.121:49189, Gage, Gage, , )
Connect request from: IP:58.182.240.121:49189
lan name = Gage
net name = Gage
Leaving GameConnection::onConnectRequest() - return
Entering GameConnection::onConnect(4233)
Entering messageClient(4233, 39, , )
Leaving messageClient() - return
Entering GameConnection::authCheck(4233)
AUTHCHECK: 4233
Internet client connecting to internet server, regular authentication
Leaving GameConnection::authCheck() - return 4233
Leaving GameConnection::onConnect() - return 4233
Entering servAuthTCPobj::onConnected(4234)
Leaving servAuthTCPobj::onConnected() - return
Entering servAuthTCPobj::onLine(4234, HTTP/1.1 200 OK)
Leaving servAuthTCPobj::onLine() - return
Entering servAuthTCPobj::onLine(4234, Date: Thu, 12 Feb 2009 00:22:18 GMT)
Leaving servAuthTCPobj::onLine() - return
Entering servAuthTCPobj::onLine(4234, Server: Microsoft-IIS/6.0)
Leaving servAuthTCPobj::onLine() - return
Entering servAuthTCPobj::onLine(4234, X-Powered-By: ASP.NET)
Leaving servAuthTCPobj::onLine() - return
Entering servAuthTCPobj::onLine(4234, Content-Length: 4)
Leaving servAuthTCPobj::onLine() - return
Entering servAuthTCPobj::onLine(4234, Content-Type: text/html)
Leaving servAuthTCPobj::onLine() - return
Entering servAuthTCPobj::onLine(4234, Set-Cookie: ASPSESSIONIDACBDSTTQ=PNDJOEGBOADOPOBJPGKIHDPG; path=/)
Leaving servAuthTCPobj::onLine() - return
Entering servAuthTCPobj::onLine(4234, Cache-control: private)
Leaving servAuthTCPobj::onLine() - return
Entering servAuthTCPobj::onLine(4234, )
Leaving servAuthTCPobj::onLine() - return
Entering servAuthTCPobj::onLine(4234, NO)
Authentication Failed for Gage (58.182.240.121).
Leaving servAuthTCPobj::onLine() - return
Issuing Disconnect packet.
Entering GameConnection::onDrop(4233, Server could not verify your Blockland ID.)
Entering GameConnection::onClientLeaveGame(4233)
Entering serverCmdStopTalking(4233)
Leaving serverCmdStopTalking() - return 4233
Entering GameConnection::ClearEventSchedules(4233)
Leaving GameConnection::ClearEventSchedules() - return
Entering GameConnection::ClearEventObjects(4233, 262144)
Leaving GameConnection::ClearEventObjects() - return
Entering GameConnection::resetVehicles(4233)
Leaving GameConnection::resetVehicles() - return 4229
Leaving GameConnection::onClientLeaveGame() - return 4233
Entering removeFromServerGuidList()
Leaving removeFromServerGuidList() - return 0
CDROP: 4233 IP:58.182.240.121:49189
Entering WebCom_PostServer()
Posting to master server
Entering getMainMod()
Leaving getMainMod() - return saves
Leaving WebCom_PostServer() - return 7
Leaving GameConnection::onDrop() - return 7
It just seems like his standard auth is failing but the auth RTB uses and the auth the server uses are rejecting it.