DCOM 10016 Event Error

After installing SBS 2008, you may begin to see DCOM 10016 event errors being reported in your SBS Monitoring reports as soon as users begin to use Sharepoint/Companyweb. This error is also identified if you run the SBS 2008 Best Practices Analyzer. There have been several posts on how to fix this error, but the instruction always were vague in one specific step.

First, here is the DCOM error as reported in the event log and within the SBS Monitoring report:

Event Source: DCOM  Event Id: 10016
Event Details: The application-specific permission settings do not grant Local Activation permission for the COM Server application with CLSID {61738644-F196-11D0-9953-00C04FD919C1} to the user NT AUTHORITY\NETWORK SERVICE SID (S-1-5-20) from address LocalHost (Using LRPC). This security permission can be modified using the Component Services administrative tool.

And here is the error as reported in the SBS BPA report:
Local activation permission to the IIS WAMREG Admin Service required

To fix this issue, perform the following steps:

* From the SBS console, click Administrative Tools > Component Services
(or, if you prefer: click Run > comexp.msc)
* Expand down Component ServicesComputersMy ComputerDCOM Config
* Right click on IIS WAMREG Admin Service, then click Properties
Click on the Security tab
* Click the Edit… button within the Launch and Activation Permissions section
* Click Add and add the user named: ‘Network Service
(NB: this is the step that confuses people. Most instructions simply tell you to add the appropriate user, but do not make it clear which user to add!)
* Click on the checkbox to Allow (enable) the Local Activation rights option for this user
* Click OK twice, and close Component Services
* Finally reboot the server for good measure and to ensure the change takes effect

Hope this helps!

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