QuickBooks: COMException: The user you are trying to log in with is already logged in from another machine.

You may receive the following error when connecting to QuickBooks:
  • System.Runtime.InteropServices.COMException: The user you are trying to log in with is already logged in from another machine.

If the user is not already logged in from another machine, then it may be necessary to restart the machine where QuickBooks is located.

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