Double login to Terminal Servers with RD Connection Broker

If your users are frustrated by the double login prompt while attempting to connect to terminal server (2008 R2 in my case) in RD Connection Broker farm you may try few things.

1) Make sure users are entering their credentials on the RDP client and not when they are already connected to the server.

2) Enable Credssp on windows XP SP3

Click Start, click Run, type regedit, and then press ENTER.
In the navigation pane, locate and then click the following registry subkey:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa
In the details pane, right-click Security Packages, and then click Modify.
In the Value data box, type tspkg. Leave any data that is specific to other SSPs, and then click OK.
In the navigation pane, locate and then click the following registry subkey:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders
In the details pane, right-click SecurityProviders, and then click Modify.
In the Value data box, type credssp.dll. Leave any data that is specific to other SSPs, and then click OK.

3) Create RDP shortcut and edit it with notepad, add the following lines:

prompt for credentials on client:i:1

enablecredsspsupport:i:1

Links: http://social.technet.microsoft.com/Forums/en/winserverTS/thread/53cdb3ee-7c73-4cda-aff9-afffec4b94f3

http://support.microsoft.com/kb/951608