WMI Providers with ASP.NET

Question

I am writing a small ASP.NET page to discover and display information for installed SSRS instances on a local server.

I found the following tool really useful for Microsoft ... WMI code creator

The generated code works great when run from the command line. However, when I try to execute the same code on my ASP.NET page, I get ...

"Runtime Error" Exception Details: System.Runtime.InteropServices.COMException

This is the code ...

ManagementObjectSearcher searcher = new ManagementObjectSearcher("root\\Microsoft\\SqlServer\\ReportServer\\[INSTANCE_HERE]\\v10\\Admin", "SELECT * FROM MSReportServer_ConfigurationSetting"); foreach (ManagementObject queryObj in searcher.Get()) { Response.Write(string.Format("InstanceName: {0}", queryObj["InstanceName"])); } 

I assume that there are some problems with permissions through IIS, however I would be grateful for the final answer. I thought this could be a problem with all WMI providers through ASP.NET, however the following code works fine on the page ...

 ManagementObjectSearcher searcher = new ManagementObjectSearcher("root\\CIMV2", "SELECT * FROM Win32_OperatingSystem"); foreach (ManagementObject queryObj in searcher.Get()) { Response.Write(string.Format("Name: {0}", queryObj["Name"])); } 

Any help on what exactly is going on behind the scenes, and perhaps why I get the above exception, would be very welcome.

Answer 1

Add a network service account to startup conditions for DCOM using dcomcnfg.

Enter dcomcnfg in cmd

go to Component Services → My Computer → Compilation Security → Lauch and activate permissions → Change default value → Add ...

Now add Network Service and allow all its permissions.