Cannot Connect to Server – A network-related or instance-specific error

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: Named Pipes Provider, error: 40 – Could not open a connection to SQL Server)

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TITLE: Cannot Connect to Server – A network-related or instance-specific error

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I found the following techniques helpful:
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A.
Make sure your database engine is configured to accept remote connections:
}} Start } All Programs } SQL Server 2005 } Configuration Tools } SQL Server }} Surface Area Configuration
}} Click on Surface Area Configuration for Services and Connections
}} Select the instance that is having a problem } Database Engine } Remote Connections
}} Enable local and remote connections
}} Restart the instance
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B
You may need to create an exception on the firewall for the SQL Server instance and port you are using:
}} Start } Run } Firewall.cpl
}} Click on the exceptions tab
}} Add sqlservr.exe (typically located in C:Program Files (x86)Microsoft }} SQL ServerMSSQL.xMSSQLBin, check your installs for the actual folder path) and port (default is 1433)
}} Check your connection string as well

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C
Check if your SQL server services is up and running properly:

Go to All Programs } Microsoft SQL Server 2008 } Configuration Tools } SQL Server Configuration Manager } SQL Server Services
Check to make sure SQL Server service status is Running.
In addition, ensure that your remote server is in the same network. Run sqlcmd -L to ascertain if your server is included in your network list.

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D
Enable TCP/IP in SQL Server Configuration

When two or more SQL Servers are connected across the network they do all communication using TCP/IP. The default port of SQL Server installation is 1433. This port can be changed through SQL Server Configuration Manager. TCP/IP should be enabled for SQL Server to be
connected.

Go to All Programs }} Microsoft SQL Server 2008 }} Configuration Tools }} SQL Server Configuration Manager }} Select TCP/IP
Right Click on TCP/IP }} Click on Enable
You must restart SQL Server Services for all the changes to take effect. Right-click and go to the menu properties to select the location where the default port of the SQL Server can be changed.

#sqlserver #mssqlserver #sql

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In this video, you will learn how to fix A network-related or instance-specific error that occurred while establishing a connection to SQL Server

In this video, you will learn solutions for all versions of MS SQL server Error 26 – When Network Error Locating Server Instance occurs. The issue is simple however you should address it correctly.

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a network-related or instance-specific error occurred while establishing a connection to the SQL server
a network-related or instance-specific error occurred while establishing a connection to the SQL server
a network-related or instance-specific error occurred while establishing a connection to the SQL server. the server was not found or was not accessible. verify that the instance name is correct and that the SQL server is configured to allow remote connections. (provider: named pipes provider, error: 40 – could not open a connection to SQL server) (.net SQL client data provider)
a network-related or instance-specific error occurred while establishing a connection to the SQL server. the server was not found or was not accessible. verify that the instance name is correct and that the SQL server is configured to allow remote connections.