Rob Eberhardt

I've fought with this before, and am getting it again on a fresh SBS R2 install in monitoring reports (and the Event Viewer/System log):

The application-specific permission settings do not grant Local Activation permission for the COM Server application with CLSID {E579AB5F-1CC4-44B4-BED9-DE0991FF0623} to the user NT AUTHORITY/NETWORK SERVICE SID (S-1-5-20). This security permission can be modified using the Component Services administrative tool.

It took a long time to track down/fix the first time.  It was faster this time, but I'm documenting it now for future reference.  I underlined the important bits above.

First connect the dots:

1. Looked up that CLSID with regedit in HKCR\CLSDID\{E579AB5F-1CC4-44B4-BED9-DE0991FF0623}
2. Looked up its AppID there: {56BE716B-2F76-4dfa-8702-67AE10044F0B}
3. Open Component Services: Start > Run > dcomcnfg
4. (Guess that it's VSS related since SBS often has VSS errors, and) open My Computer > DCOM Config > Volume Shadow Copy Service > properties dialog.
5. Confirm Volume Shadow Copy Service has that Application ID: {56BE716B-2F76-4dfa-8702-67AE10044F0B}

Then actually make the fix:

1. Open Security tab > Launch and Activation Permissions > [Edit] button
2. [Add] Network Service,  [OK]
3. Allow Local Activation permissions to Network Service,  [OK], [OK]

My opinion: connecting the dots shouldn't be so nearly much more involved than making the fix.

(Credit to this article for documenting the basic troubleshooting process.)