Unable to load DLL after Impersonating (0x80070542)

Question

I have an application that prompts a user for credentials and impersonates the user before taking some action on that user's behalf.  However, when I try to call some framework methods that require .NET to load a native DLL, the call fails with the
following error:
System.DllNotFoundException: Unable to load DLL 'secur32.dll': Either a required impersonation level was not provided, or the provided impersonation level is invalid. (Exception from HRESULT: 0x80070542)
I've simplified the duplication scenario down to the following:
this.userToken = IntPtr.Zero;
bool authenticated =
Win32.LogonUser(
username,
domain,
password,
LogonTypes.Network,
LogonProviders.Default,
out userToken);
if (authenticated)
this.impersonationContext =
WindowsIdentity.Impersonate(this.userToken);
// This call blows up:
string userDomain = Environment.UserDomainName;
If I make a call to Environment.UserDomainName before impersonating, no exception is thrown (presumably the DLL is loaded before impersonation, so no attempt is made afterwards).

Answer 1

Hi Travis,
I'm writing to check the issue status, please feel free to let us know if you have any concern.
Sincerely,
Eric
MSDN Subscriber Support in Forum
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