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Editorial Team
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Asked: 2026-05-16T14:40:30+00:00

I installed SQL Server 2008 Management Studio, and uninstalled 2005 as a consequence my

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I installed SQL Server 2008 Management Studio, and uninstalled 2005 as a consequence my .net application with a local SQL Server express doesn’t work anymore. I tried with nothwind 2008 sample at my App_Data folder. The connection string is : 

Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\NORTHWND.MDF;Integrated Security=True;User Instance=True

When I try to connect to the file and testing the connection I get the following error:

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)

I verified the security setting of the file and put everyone full control. What setting should I update in order to be able to open 2008 version. Any help would be greatly appreciated.

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1 Answer

  1. Editorial Team

    1) Go to Start -> Microsoft SQL Server 2008 -> Configuration Tools -> SQL Server Configuration Manager

    Check whether all the services are running or not. If not, start them. If yes, try to restart them once.
    And see if it works.

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