How to resolve a System.Security.Principal.IdentityNotMappedException?

The System.Security.Principal.IdenityNotMappedException seems to come up time to time and I thought I would write about what this exception means and how to resolve the issue. The first thing to understand is that in Windows, User Accounts and Groups have a unique and immutable identifier known as a Security Identifier (SID).  (You can find more…

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Getting Linger to RST a connection in .NET

Jeff here again from the Windows SDK Team. Recently, I had a case where the customer required use of the TCP Linger option to reset a connection when it was closed. I was able to get it to work in native Winsock with no problem, but getting the reset to be sent in .NET was…

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