MSTSC V6, both in XP and Vista, now asks for credentials EVERYTIME you connect! I want the server to ask, not the client! Add this line to the Default.rdp file located in your My Documents folder.

enablecredsspsupport:i:0

Also:

authentication level:i:0

You may need to save as another name, then

rename the Default.rdp and replace the file.

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Below are the default.rdp contents as set above

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screen mode id:i:2

desktopwidth:i:1024

desktopheight:i:768

session bpp:i:32

winposstr:s:2,3,0,0,800,600

full address:s:venus

compression:i:1

keyboardhook:i:2

audiomode:i:1

redirectprinters:i:0

redirectcomports:i:0

redirectsmartcards:i:1

redirectclipboard:i:1

redirectposdevices:i:0

displayconnectionbar:i:1

autoreconnection enabled:i:1

authentication level:i:0

prompt for credentials:i:0

negotiate security layer:i:1

remoteapplicationmode:i:0

alternate shell:s:

shell working directory:s:

disable wallpaper:i:1

disable full window drag:i:0

allow desktop composition:i:1

allow font smoothing:i:1

disable menu anims:i:0

disable themes:i:0

disable cursor setting:i:0

bitmapcachepersistenable:i:1

gatewayhostname:s:

gatewayusagemethod:i:0

gatewaycredentialssource:i:4

gatewayprofileusagemethod:i:0

drivestoredirect:s:

enablecredsspsupport:i:0