If a username has been changed on a system, Remote Desktop sessions into that computer cannot login with the new username. The old username and password still work.

Consider the following scenario:

  1. Install Windows 7 on two systems
  2. Setup both systems with a password
  3. On the host system, in the remote tab of system properties, select “Allow connections from computers running any version of Remote Desktop”
  4. On the host system, change the username and restart
  5. On the client system, open the Remote Desktop Connection application and enter the computer name of the host system
  6. When prompted, enter the new username and password of the primary user account on the host system. Note that you are unable to connect
  7. Enter the old username and password. You are now able to connect

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