Login failed for user 'NT AUTHORITY\SYSTEM' I tried to add NT AUTHORITY/SYSTEM to SSMS (SQL Server Management Studio) logins, but it was already a principal, showing the following error:
Feb 4, 2009 · NT_AUTHORITY\LocalService (aka the Local Service account), or NT AUTHORITY\NetworkService (aka the Network Service account). That capability only was added.
Apr 27, 2015 · For some specific purpose , I need to add NT SERVICE\MSSQLSERVER account to Administrator Group . It can be done through Computer Management->Local Users and Groups.