Failed to generate a user instance of SQL Server due to failure in retrieving the user's local

After the computer has been reinstalled these days, SQL Server 2008 has not been installed. One is not commonly used, and the other is that I can also use the Express version. However, when I deployProgramThe following error is reported. I always remember that I had encountered this kind of error, so I first used Google. There were not a few such errors. And EnglishArticleMostly. So I will simply record it and use the language of the error to facilitate the search engine.

The following is a solution. You can solve this problem by configuring web. config. Is the following sentence:

<Identity impersonate = "true" username = "systemusername" Password = "systempassword">

This problem is solved after you join us, hoping to help people who encounter such errors.