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If you have a Windows XP machine that belongs to the domain and you attempt to set a Firewall rule to allow Remote Desktop through, don’t use the default subnet setting if you wish to accept those connections from your subnet.

I’ve had consistently rejected connections when using this setting and connecting from the same subnet.  Instead, I found that manually specifying the subnet as a custom rule setting works consistently.

Oddly, this is only an issue on the Princeton domain, and is likely the result of a Group Policy trickle-down.