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Cannot open database requested by the login. The login failed. Login failed for user 'NT AUTHORITY\NETWORK SERVICE'. - ASP.NET,C#.NET,VB.NET,JQuery,JavaScript,Gridview
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How to Fix Login Failed for User (Microsoft SQL Server, Error: 18456) Step-By-Step – Add SQL Administrator to SQL Management Studio – ITProGuru Blog
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SQL SERVER - Fix : Error: 4064 - Cannot open user default database. Login failed. Login failed for user - SQL Authority with Pinal Dave
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