SQL Server 2008 R2无法登录

Question

I am working on Windows Server 2003 using SQL Server 2008 R2 and the .NET Framework 4.

My problem

I can't login to my database from my website although I can login from my Management Studio

I created a login named William .

My connection string is

<add name="TestDbConnectionString" 
     connectionString="Data Source=(local);Initial Catalog=RESv5;User Id=William;Password=MYPASSWORD;"
     providerName="System.Data.SqlClient" />

I got this error:

Login failed for user 'William'

NOTE:

The same username and password I use in the Management Studio and I can login.

Answer 1

Are the website, the SQL Server instance, and SSMS all running on your local machine?

If they are not the same machine, then that is probably the source of the problem: "(local)" on a different machine will mean something different than "(local)" on your own personal laptop.

Try this for the Data Source portion of the name:

Data Source=LocalServerName

... where LocalServerName is the name of the server on which the SQL Server instance is running. If the database is on your machine and the website is elsewhere, use the name of your machine for LocalServerName .

ETA: If you have more than one SQL Server instance running and the one you want is NOT named MSSQLSERVER, you would reference it like this:

Data Source=.\SQLEXPRESS

As marc_s points out, if the instance is called MSSQLSERVER, you can use (local) as you are doing, or

Data Source=.