实体框架无法打开登录请求的数据库 - 用户登录失败

Question

I've just uploaded my website to a server and getting an error called "cannot open database requested by the login the login failed login failed for user".

In my global.asax file on Application_Start method, I have this :

Database.SetInitializer<MyContext>(null);

So I created my database manually and after used script to create tables. But when I want to login, it gives me an error.

On my database my tables, username and password for login page seem fine. Just can't connect to the database.

My connectionstring is:

 <add name="MyDatabase" connectionString="Data Source=serveradress;Initial Catalog=MyDatabase;User ID=username;Password=password;MultipleActiveResultSets=True;App=EntityFramework" providerName="System.Data.SqlClient" />

I'll be grateful for advice.

Answer 1

Connection to database server

You should check if your server can connect to the database server. Perhaps a firewall is blocking the connection.

If the server is using TCP/IP, then the simple way is to just telnet to the SQL Server port and see if it connects. By default, that's port 1433, so this should work:

telnet servername 1433

That will probably be appropriate in most cases.

If it's using a different port, or dynamic ports (common with a named instance), then you'll need to determine which port it's currently listening on. Check SQL Server configuration manager to see if it's a specific port, or dynamic ports. If it's using dynamic ports, then as long as you don't have multiple instances on the server, netstat -abn is probably the simplest way to find what it's using. Otherwise, dig through the Windows event log or the SQL Server error log for a message indicating which port is in use by the instance.

If SQL Server is using Named Pipes, then I believe if you're able to access shares on the machine, you have adequate network connectivity. This article says you can go further and try connecting to the IPC$ share:

http://msdn.microsoft.com/en-us/library/aa275787%28v=sql.80%29.aspx

net use \\servername\IPC$

Security settings on database server

Go to SQL Server >> Security >> Logins and right click on "username" and select Properties.

In newly opened screen of Login Properties, go to the “User Mapping” tab. Then, on the “User Mapping” tab, select the desired database – especially the database for which this error message is displayed. On the lower screen, check the required role.

Answer 2

I've just solved the problem. The problem is "typical programmers problem". I needed to write MyDatabase but I wrote MyDatabse. I'm trying to solve this problem since at 11 o'clock. Thank you for your all replies.