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1. Find and open the administrative tool DCOMCNFG.EXE
   
   
   

2. Double-Click "Computers" in the middle "Name" column to reveal the "My Computer" icon, right-click it and click "Properties"
   
   (click picture to enlarge)
   
   

3. Click the "COM Security" tab
   
   
   
4. Click the "Edit Default..." button within the "Access Permissions" frame
   
   
   
5. Click the "Add..." button
   
   
   
6. Click the "Locations..." button
   
   
   

7. Select the top entry with the name of your computer (here, it is "PDS-RP-PAR8") and click the "OK" button
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8. Type the object name "IIS APPPOOL\CustomDVIPool". Replace the "CustomDVIPool" part of the name with the actual name you have used when creating the custom application pool, but keep the "IIS APPPOOL\" prefix (be aware that there is a space between IIS and APPPOOL).
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   Note
   The IIS APPPOOL area is not browseable, so you wouldn't find it if you click the "Advanced..." button and use the "Find Users and Groups" dialog, so you must type the full name yourself (or copy and paste it from here)

    

9. Click the "Check Names" button and ensure that your application pool name now appears underlined. Click "OK" to close the window
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10. You will now find your application pool name in the list of group or user names, and "Local Access" is allowed. Click "OK" to close the window
    
    
    
11. Click the "Edit Default..." button within the "Launch and Activation Permissions" frame
    
    
    
12. Repeat steps 5 to 9 to add your application pool name within this window, then check "Local Activation", "Allow" to make your window look like this:
    
    
    Then, close all windows one at a time by clicking the "OK" button and finally close the "Component Services" window.

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