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After successfully changing default RDP port on remote Windows 2008 R2, I configured that inbound rule to apply only to authenticated connections (because i needed to assign ONLY specific users to be able to remotely connect).

Once I selected the option (something like that) "allow this rule only to authenticated connections".. the remote server disconnected me and I can no longer reach server via RDP.

How can I access again? Any advice for me please?

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You will have to psychically be there and make the changes unless you have some sort of IP based KVM to connect with? – Cold T Mar 22 '12 at 14:01
Did you do this due to the recent security vulnrability in rdp, if so this won't mitigate a thing. – tony roth Mar 22 '12 at 14:04
@colt T: this means that i have to request a KVM from my provider.. thank you. – Grashopper Mar 22 '12 at 14:07
@tonyroth: no, i did it in order to allow only specific users to log in via RDP – Grashopper Mar 22 '12 at 14:08
What are my options to secure server to allow rdp only from specific users without messing up again.. any recommendations for me? – Grashopper Mar 22 '12 at 14:09

If you can't use Remote Registry to change the settings by hand, you'll need direct console access to log in. An IP KVM, or LOM console would do the trick.

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What are my options to secure server to allow rdp only from specific users without messing up again.

I don't know about the firewall part, but you can you just exclude certain users from membership in the "Remote Desktop Users" group, or similar group with the remote desktop rights denied. The users will presumably still connect to the server, but will get a message about how they are not allowed to log in.

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