Login failed for user 'NT AUTHORITY\NETWORK SERVICE'

Question

I been strugling with this for 2 days now without comming any closer to solution. I have read 20-30 threads alteast and stil can not resolve this.

Please help me out

Answer 1

Make sure that the database is created. I got the same error when I applied the migration to the wrong project in the solution. When I applied the migration to the right project, it created the database and that solved the error.

Answer 2

I am using Entity Framework to repupulate my database, and the users gets overridden each time I generate my database.

Now I run this each time I load a new DBContext:

cnt.Database.ExecuteSqlCommand("EXEC sp_addrolemember 'db_owner', 'NT AUTHORITY\\NETWORK SERVICE'");

Answer 3

I was experiencing a similar error message that I noticed in the Windows Event Viewer that read:

Login failed for user 'NT AUTHORITY\NETWORK SERVICE'. Reason: Failed to open the explicitly specified database. [CLIENT: local machine]

The solution that resolved my problem was:

1. Login to SqlExpress via SQL Server Management Studio
2. Go to the "Security" directory of the database
3. Right-click the Users directory
4. Select "New User..."
5. Add 'NT AUTHORITY\NETWORK SERVICE' as a new user
6. In the Data Role Membership area, select db_owner
7. Click OK

Here's a screenshot of the above: