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Editorial Team
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Asked: 2026-05-23T10:34:54+00:00

After 2 Days of search i still didnt find an answer. Situation: Server: SQL

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After 2 Days of search i still didnt find an answer.

Situation:

Server:
SQL Server 2008 Express installed on RemoteServer
TCP/IP: Enabled on port 1433
Named Pipes: Enabled
Database: ConDB.mdf (attached to server)

Workstation:
Microsoft Management Studio: Connection to database works

Servertype: Databasemodul
Servername: MTTC5020\SQLEXPRESS,1433

Authentifcation: SQL
Server-Authentification
Username:
testuser
Password: 1234

Visual Studio 2010 Express:

Error on Database Explorer: SQL
Network Interfaces, error: 26 – Error
Locating Server/Instance
Specified

Same Error Through Connection via Appconfig and connectionstring:

<connectionStrings>
    <add name="ContainerDB.My.MySettings.ConDBConnectionString" connectionString="Data Source=MTTC5020\SQLEXPRESS,1433;Initial Catalog=ConDB.mdf;User ID=testuser;Password=1234;Integrated Security=false"
        providerName="System.Data.SqlClient.SqlConnection" />
</connectionStrings>

I also tried many other connectionstrings (Via IP / AttachedDBFileName / etc.)

I also tried everything here: MSDN

portcheck through SQLCMD -U testuser -P 1234 -S MTTC5020\SQLEXPRESS,1433 works aswell

Any suggestions?

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1 Answer

  1. Editorial Team

    I now found the issue.
    The connectionstring for the dbml is not only stored in the .config file.

    checkout the workaround for this at:
    LINQ to SQL Connection Strings

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