Update:  I have created a registry file which makes these changes for you.  Please see the disclaimer below.  Download the file here.  Simply run it to merge the registry changes, and reboot for the changes to take effect.

If you get this message, it’s because you’re trying to connect to a computer which uses a newer version of the remote desktop protocol, which supports a higher level of encryption.  The connection will not go through because you are using an older version.

If you’re using Windows XP, make sure you are up to date with windows update.  You will need to be using service pack 3 for these instructions to work.  Also make sure there are no updates for the remote desktop client listed in windows update.

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Originally posted 2009-06-30 23:34:14.