Network Service and Event Log

By default, ASP.NET applications that run under the default Network Service identity can write to the Windows event log by using an existing event source, but they cannot create new event sources. To create an event source, your app needs permissions to create a new registry entry beneath the following key: HKLM\SYSTEM\CurrentControlSet\Services\Eventlog\.

You have two options:

• Grant your ASP.NET process account (or impersonated identity if your application uses impersonation) permissions on the registry key mentioned above.
• Create the event source at application install time when administrator privileges are available.

Adopted from http://msdn.microsoft.com/library/en-us/dnpag2/html/PAGPractices0001.asp.