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Updated September 19, 2018
Exception 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: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)
Connection string - Data Source=*SQL SERVER NAME*;Initial Catalog=*DB NAME*_Prod;User ID=*DB USER NAME*;Password=*******;Connect Timeout=20;Load Balance Timeout=120;Application Name=SolarWinds.DataProcessor@domain-DataProcessorHost-0;Workstation ID=*MACHINE ID*
This error indicates that your physical server is not able to connect to SQL Server.
It is the most common error where your SQL Server is rejecting a connection form Outside. You might have incorrect Credentials to access the SQL server; therefore, the Configuration wizard is failing to connect to the database server.
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: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)
Please consult your DBA before making any changes.
Possible troubleshooting steps:
Make sure the SQL Server and SQL Server Browser services are running at all times on the server hosting your SQL instance.
The following screenshots are an example using SQL EXPRESS edition. The screenshots are a property of © 2016 Microsoft.
Make sure the SQL Server and SQL Server Browser services are running at all times on the server hosting your SQL instance.
You can also use third-party DB connectivity tools to check if you are able to reach out to SQL server.
To quickly test a database connection, try the Database Connection String / Command / SQL Tester Utility:
Learn more:
Download details: Microsoft® SQL Server® 2008 Management Studio Express - Microsoft Download Center (© 2016 Microsoft, available at https://www.microsoft.com, obtained on December 8, 2016)
Once Done, follow the instructions in the following post. Make sure you are able to connect to SQL Server using SQL Studio.
How to enable remote connections in SQL Server 2008?
(© 2016 Microsoft, available at https://blogs.msdn.microsoft.com, obtained on January 16, 2017)
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network-related or instance-specific error occurred while establishing a connection to SQL Server, Named Pipes Provider, error: 40 - Could not open a connection to SQL Server