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DCOM Error Message

I have created a domain in my company. My PDC and BDC (Web server) work ok, but my backup Web Server always got this error message.(I checked my Event Viewer)
"DCOM got error "An instance of the service is already running." attempting to start the service IISADMIN with arguments "" in order to run the server:

What does it mean, and how to solve it?

1 Solution
Another service has already started DCOM.  Message is common but according to Microsoft "benign."  Check the following Q Article which I have supplied.  If this message is annoying enough (it is to me) then you can fix the "benign" problem with   SP5 (SP5 in my experience fixes this issue, I am unsure if SP6 works, I have not tried it.)  

IMPORTANT:  Make sure you follow the SP instructions and backup data and create Rdisks before applying them

Here is the Q



  If a client attempts to connect to a COM server after the COM server starts, but before the
  COM server registers its factory, the COM will attempt to start the service. For a service
  like the World Wide Web Publishing Service (W3SVC) in Internet Information Service version
  4.0, the second attempt to connect to the COM server will fail; however, the
  CoCreateInstance should succeed.


  After you install the Windows NT Option Pack, you may receive the following error messages
  in the event log:

       System Error, Source=DCOM, Event ID=10005

       The event details contains the description:

       DCOM got error "An instance of the service is already running. "
       attempting to start the service IISADMIN with arguments "" in
       to run the server:


       Application Error, Source=Ci, Category=CI Service, Event ID=4147

       The event details contains the description:

       The IISADMIN service is not available, so virtual roots cannot be


  These error messages are generated because another application, such as Microsoft
  Transaction Server, has already started the DCOM (the Distributed Component Object
  Model) Service. These messages do not indicate an actual problem and are benign.


  To resolve this problem, obtain the latest service pack for Windows NT version 4.0. For
  more information, please see the following article in the Microsoft Knowledge Base.

       Q152734 : How to Obtain the Latest Windows NT 4.0 Service Pack

  Additional query words: mts system log event viewer

  Keywords          : NT4SP4Fea
  Version           : WINNT:4.0
  Platform          : winnt
  Issue type        : kbprb

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