Troubleshooting: Identity is incorrect and Create DCOM Instance Error = 8000401a

Problem Description 1

     When using the link server, get the following errors:

     SQLSetConnectAttr failed
     QB Open Connection Failed. Create DCOM Instance Error = 8000401a, Unknown error.. Created qbXMLRP2 OK.

     I ran the DCOMCNFG.EXE utility and gave permission to Internet Guest Account (<IUSR_<machine_name>), ASP.NET Machine Account (ASPNET), and INTERACTIVE accounts.

     When I run the Test DCOM Script to troubleshoot the linked server, I get successful messages except for the following errors:

     QBXMLRPEQODBCInteractive.RequestProcessor The server process could not be started because the configured identity is incorrect. Check the username and password.

     QBXMLRP2EQODBCInteractive.RequestProcessor The server process could not be started because the configured identity is incorrect. Check the username and password.'

     We have a 3-user QB license, and one of the licenses is being used on the server. What 'configured identity' is it referring to?

Solutions 1

     The identity is The Interactive user or The Launching user in the QODBC DCOM configuration. See: How to set up QODBC DCOM Server for more.

Problem Description 2

     I am having a very similar problem with a formerly working linked server on SQL Server 2005, Windows Server 2003, and QODBC Server Edition. I get these error messages:

OLE DB provider "MSDASQL" for linked server "QODBC" returned message "[Microsoft][ODBC Driver Manager] Driver's SQLSetConnectAttr failed".
OLE DB provider "MSDASQL" for linked server "QODBC" returned the message "[QODBC] QB Open Connection Failed. Create DCOM Instance Error = 8000401a, Unknown error. Created qbXMLRP2 OK.".
Msg 7303, Level 16, State 1, Line 1
Cannot initialize the data source object of OLE DB provider "MSDASQL" for linked server "QODBC".

     The connection works from the QODBC Support Wizard but not from the linked server. I have been through the manual DCOM configuration again, and everything looked fine. Any ideas?

Solutions 2

Give USERS rights

   You need to give all your AUTHENTICATED USERS rights to the "C:\Program Files\QODBC Driver for QuickBooks" using the Security tab.

     Give all your AUTHENTICATED USERS and INTERACTIVE accounts permissions to launch and access qbXMLRP2eQODBCInteractive.exe DCOM object using dcomcnfg by doing the following:

1. Launch DCOMCNFG.EXE by clicking the Start button -> selecting Run, -> typing "Dcomcnfg" in the Run dialog box.

2. Expand the Console Root tree to the following: Console Root -> Computers -> My Computer -> DCom Config

3. Highlight qbXMLRP2eQODBCInteractive and select Action -> Properties from the Main menu (Or right-click menu).

4. In the Security tab, select Customize in the Launch Permissions frame and click Edit, then add all your AUTHENTICATED USERS, Internet Guest Account (<IUSR_<machine_name>), ASP.NET Machine Account (ASPNET), and INTERACTIVE to the Launch Permissions dialog box.