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The application trying to connect to QuickBooks is not supported while multiple instances of QuickBooks are running.
Posted by Rajendra Dewani (QODBC Support) on 26 March 2013 07:16 AM
 
IsAService: False
Begin Session Failed. S0000 00000 [QODBC] QuickBooks Begin Session Failed. Error = 80040438, The application trying to connect to QuickBooks is not supported while multiple instances of QuickBooks are running.
Begin Session errors can be caused when running ASP or other system service and not setting the "Advanced" button option of either "Use DCOM Servers" or "Remote Connector"

Also refer : DCom Option / Server Edition Tab missing in QODBC Setup Tab
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