Using FsrmQuotaManager with a WCF service

I'm using a WCF service that is running on an IIS 7.5 (W2k8 R2). I use this service for getting quota information about the space of a specified web site on the same IIS.

So I do have the WCF service acting as server and a local web app acting as client. The client now asks the server for the quota of a web site folder. To do so the server should use the FsrmQuotaManager. But when the service is referencing the quota manager I get an 0x80070005 (Access denied). The web service runs in it's own AppPool with the ApplicationPoolIdentity.

I always got DistributedCOM errors (10016) in the event log saying that The machine-default permission settings do not grant Local Activation permission for the COM Server application with CLSID {90DCAB7F-347C-4BFC-B543-540326305FBE} and APPID {FA3FC5CF-0304-4CAC-99F0-032AC2B15D1E} to the user MYDOMAIN\someUsername SID (S-1-5-21-1477432904-898564541-3754644009-3102) from address LocalHost (Using LRPC). This security permission can be modified using the Component Services administrative tool. So I already managed to add permission for this user (or better the group that user is in) in the ComponentServices as I often read when searching the Internet. Now I don't get that error in the event viewer anymore but when I'm referencing the FsrmQuotaManager in the services code I'm still getting the exception.

Does anyone have a clue about that? I'm really stuck at this for quite some days and I'm running out of ideas. Using the Process Monitordoesn't help.


We finally solved it. We had to impersonate around the creation of the FsrmQuotaManager object with a local administrator account. Using this we could also remove the the permission previously added in the ComponentServices.

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