I have a virtual machine (vmware) with Windows Server 2008 R2 x64 and SQL Server 2008 R2 installed.
I see 2 SQL Server services on this vm :
Both of them are use the default Network Service account to login.
And both of them are running (I see the green color).
I successfully connect to the instance
MyMachine\sqlexpress, but did not succeed to connect to the
mssqlserver instance on MyMachine.
I get an error
Login failed for user 'MyUser'. (Microsoft SQL Server, Error: 18456)
There are no registered servers, and when I try create a new registered server, I get the same error.