How to prevent from establishing a connection to SQL server. The server was not found or was not accessible.

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I have three projects 1st is Financial.Asst.core, 2nd is Financial.Asst.Data and 3rd is Financial.Asst.Web.

in first project's App.config not have any connection string. in second projects App.config has below connection string.

<div class="op">Quote:</div><connectionStrings>
    <clear />
    <add name="DefaultConnection" connectionString="Data Source=DESKTOP-J97B0AI;Initial Catalog=dada;Integrated Security=True" providerName="System.Data.SqlClient" />
  </connectionStrings>

and third project's web.config file has below connection string.

<connectionStrings>
    <add name="DefaultConnection" connectionString="Data Source=.\sqlexpress;Integrated Security=true;Initial Catalog=DESKTOP-J97B0AI;" providerName="System.Data.SqlClient" />
  </connectionStrings>

So, I am keep trying to run the solution then always getting following error.

Quote:
A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)

so guys please help me to prevent from this issue.

What I have tried:

where i Enabled the sqlserver and tcpIp services.

Posted 26-Sep-17 21:57pm

Dawood507

Updated 26-Sep-17 22:32pm

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OriginalGriff · Answer 1 · 2017-09-26T22:32:00

We can't help you: your connection string is at fault. It may be that the SQL Instance is wrong, it may be it isn't configured for remote connections, it may be that it just doesn't accept Windows Identification (via Integrated security) but needs a "proper" SQL username and password combination (the best solution, as the user can have his access restricted to just what he needs to do the job and no more). It could be the database doesn't exist on that server. We can't tell.

Have a look here: Simple SQL Connection String Creation[^] - it may help you create a strign that you can use.