How to fix a network-related or instance-specific error connecting to SQL Server

A network-related or instance-specific error occurred while establishing a connection to SQL Server. Step-by-step guide on how to solve the network related instance specific SQL connection error: www.lansweeper.com/knowledgeb...
How to fix a network related or instance specific error occurred while establishing a connection to SQL Server. Allow remote connections to sql server. How to configure a sql server to allow remote connections with SQL server 2008, SQL server 2012, SQL server 2014, SQL server 2017, SQL server 2018,...
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.
Sqlcmd: Error: Microsoft SQL Native Client: An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections.
How to Sql server is configured to allow remote connections.
Lansweeper data, reports and settings are stored in a database, which is hosted in either SQL Compact or SQL Server. If you install Lansweeper under SQL Server, by performing an Advanced Install, and the connection to your SQL Server installation is lost at some point, you may encounter errors like the ones below.
The errors below indicate that Lansweeper is unable to locate the SQL Server instance hosting your Lansweeper database. It's important to note that this does not point to database corruption or an issue with the database itself. Though there are many possible causes for a loss of SQL connectivity, below are some troubleshooting steps you can try to resolve the issue. Some of these steps must be performed within SQL Server Management Studio. If SQL Server Management Studio was not installed along with your SQL Server instance, we recommend downloading it online. (You will need to perform a search for the Management Studio that's compatible with your particular edition and version of SQL Server.)
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