Open the multiplex folder and highlight the query server.
Right-click the server, then select File > Delete (or right-click on the server icon and select Delete). Click Finish in the pop-up window to delete the server. For details, see “Deleting query servers”.
Add the query server back to the multiplex on the new machine using the Create Query Server wizard. For details, see “Creating databases with multiplex functionality”.
Moving the query server