Option 1:
Run > regedit
HKEY_LOCAL_MACHINE\Software\Microsoft\SmallBusinessServer
Right-click SmallBusinessServer, click New, and then click Key.
BusinessProductivity
Right-click BusinessProductivity, click New, and then click DWORD (32-bit) Value.
ShowAllComputers
Double click ShowAllComputers, type 1 in the Value data text box, and then click OK.
Option 2:
Open the registry editor, as a domain admin, and locate the following key:
HKLM\SOFTWARE\Microsoft\SmallBusinessServer
Right-click SmallBusinessServer, click New, and then click Key.
RemoteUserPortal
Right-click RemoteUserPortal, click New, and then click Multi-String Value.
TsServerNames
Double click TsServerNames, and insert as a value, the exact name of your Terminal (RDS) server. If you have multiple RDS servers add them each in a separate line of the value/data area.