Question

I'm seeing this error in the Event Viewer System log:

"Access denied attempting to launch a DCOM Server."

Now what?

Answer 1

You can fix it by following these steps:

1. At a command prompt, type the following command to open Distributed COM Configuration Properties:
   dcomcnfg.exe
2. On the Applications tab, in the list of DCOM servers, browse to the Machine Debug Manager entry. If this entry does not exist, type the following command at a command prompt to add the entry:
   mdm.exe /regserver
3. Re-open Distributed COM Configuration Properties, click Machine Debug Manager, and then click Properties.
4. On the Security tab, click Use custom access permissions, and then click Edit.
5. Add the FogBugz user to the access permissions for Machine Debug Manager.  (Find out which user FogBugz is running as)
6. Click OK twice to return to the Security tab.
7. On the Security tab, click Use custom launch permissions, and then click Edit.
8. Add the FogBugz user to the launch permissions for Machine Debug Manager.
9. Click OK twice to return to the Security tab.
10. On the Identity tab, click This user, and then type the user name and password of a user in the Administrators group (not the FogBugz user but an actual windows administrator)
11. At a command prompt, type the following to restart IIS:
    iisreset 

These steps were taken from this Microsoft KB article.