remote desktop vista xp error message

When I use remote desktop from a Vista machine to a XP SP2 machine, I get this error message:
"The remote computer cannot be identified because it is not set up to support authentication.
Remote computer: XXX.XXX.XXX.XXX
Do you want to connect to this computer anyway?"
If I click on "Yes" button, I still get connected into the XP SP2 machine.
When I remote from the XP SP2 machine to Vista beta 2, I don't encounter this error. Both machines are joined to my office domain controller.

Hello,
This is caused by the new authentication support in the Vista-era Remote Desktop Protocol. For now, only Vista machines support this new authentication mechanism.
This is nothing to be worried about and is the expected behavior when connecting to a Windows XP machine from Windows Vista.
- JB

Thanks Jimmy. Glad is not some security lapse on the XP machine.
"Jimmy Brush" wrote:

Hello,
This is caused by the new authentication support in the Vista-era Remote Desktop Protocol. For now, only Vista machines support this new authentication mechanism.
This is nothing to be worried about and is the expected behavior when connecting to a Windows XP machine from Windows Vista.
- JB