Error: 25 - Connection String is not valid ... SQL Server 2008 Express Edition and Visual Web Developer 2008 Express Edition

I am in VWD and went to Database Explorer to "Add Connection" to a .mdf File located on another PC on the network.  I see the following:

1) Data Source: Microsoft SQL Server (SqlClient)
2) Server Name: \\ComputerName
3) Log on to the Server: Use SQL Server Authentication
4) Connect to a database: Attach a Database File: \\Computename\FolderName\DatabaseName.mdf
5) Logical Name: [Left Blank]
6) Advanced Tab: [No Changes]
7) Clicked the Button: "Test Connection"

Receive this Error:

An error has occurred while establishing a connection to the server.  When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections. (provider: SQL Network Interfaces, error: 25 - Connection string is not valid)

I have no idea what to do.  I have spent the last 3 hours trying to fix this.  Thanks

9/22/2008 11:52:08 PM 29906 articles. 0 followers. Follow

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Can you please connection string so that we can get idea where exactly error encounters?

you can also get help from the below link.




Alpesh Dhanesha

Please don't forget to "Mask as Answer" if it helped.
9/23/2008 5:03:23 AM

Ha, well I do not have a connection string.  Maybe that is the issue.  I assumed if I used the "Add Connection" feature, it would create a connection string.  Do I have to go into web.config and create a connection string there?

9/23/2008 5:20:46 AM


yes exactly. you need to define the connection string as below in web.config

            <add connectionString="......" name="MyDatabase"  />       

Give connection string in place of "....".

You can refer this connection string by


 This may be help to you.


Alpesh Dhanesha

Please don't forget to "Mask as Answer" if it helped.
9/23/2008 7:12:48 AM

Here is what I am using for <connectionStrings> , but I still get the same error:


connectionString="Data Source=;
Initial Catalog=MyDatabase;
Persist Security Info=True;
User ID=userName;



9/23/2008 6:19:31 PM

Here is an answer I got on this question from another user from different forum:

I ran into that error when I was running SQL Server Express because, by default, it has remote connections disabled. I had to enable TCP/IP connections. SQL Server 2005 Surface Area Configuration > Surface Area Configuration for Services and Connections. Then select the instance of SQL Server, Database Engin, Remote Connections. I changed mine to "Local and remote connections, using TCP/IP only". I guess if that doesn't work you could also enable "Using both TCP/IP and named pipes".

It could also be a bit simpler - your username/password doesn't have access to everything it needs on the server.

Beware of bugs in the above code; I have only proved it correct, not tried it.
(Donald Knuth)
9/23/2008 6:30:11 PM

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