No remote desktop logon possible from outside the Active Directory forest

Assume the following scenario:

  • You want to establish a remote desktop connection.
  • The client computer from which the connection is made is not a member of the same Active Directory forest as the target computer.
  • The connection fails with the following error message:
A user account restriction (for example, a time-of-day restriction) is preventing you from logging on. For assistance, contact your system administrator or technical support.

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