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DCOM Error Access Denied in Event Logs Win2000 Server

Working with Win 2000 Server
In the eventlogs recently found DCOM Errors

Access denied attempting to launch a DCOM Server. The server is:
The user is SYSTEM/NT AUTHORITY, SID=S-1-5-18

I searched the Registry and found that it corrisponds with Exchange.
Can someone Explain what it is and why it happens so I can try to fix it.
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1 Solution
The reason for this is that the system account does not have sufficient permissions on this particular object. To troubleshoot this issue, we'd have to add the system account to this object. it could either be the registry key, or the dll which is referrenced under the registry key. A third party installation could have messed up the permissions. if nothing works, then you could do a repair installation of the application. by the way, it would be more helpful if you could place the entire error message along with the event id.

You said you searched for {9DA0E103-86CE-11D1-8699-00C04FB98036} in the registry and it corresponds to exchange, right? Now go to the properties of this particular key in the registry and give it the permissions for the account for which you got the error message.
also, does the key point to any dll? you could also check for the permissions on the dll.

also go to start-->run-->dcomcnfg, expand computers, expand my coumputers, expand dcom config and see if that particular object is referenced there. then go to the properties and make sure that the launch and activation permissions and access permissions is set to "use default". The configuartion permission should be set to customise and the system account should have full control.

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