How to force a login for an administrator when using Remote Desktop Connection?
Solution 1:
Turn off fast user switching, it causes the prompt box to appear for the other user regardless of their group memberships.
EDIT: I could not find anything in HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Terminal Server Client (or HKCU) that will disable this behavior.
Additional Info: Here's an article from MS on the how RDP acts with and without Fast User Switching enabled, for various user scenarios. It's for XP, but the rules still apply.
Solution 2:
Try the /admin switch:
Computer: brettbox /admin
(or, on Start - Run:
mstsc /v:brettbox /admin
)