How to troubleshoot error "A network-related or instance-specific error occurred while establishing a connection to SQL Server"?
This article provides a detailed troubleshooting guide for resolving the error “A network-related or instance-specific error occurred while establishing a connection to SQL Server” encountered during the upgrade of Orchestrator.
Steps to Resolve:
-
Enable Named Pipes Protocol:
- Open SQL Server Configuration Manager.
- Navigate to
SQL Server Network Configuration
->Protocols for [Your Instance Name]
. - Ensure "Named Pipes" is enabled. If it is disabled, right-click and select "Enable".
-
Check SQL Server Services:
- Open
Services.msc
. - Ensure that the SQL Server services (SQL Server, SQL Server Browser) are running. Start them if they are stopped.
- Open
-
Verify SQL Server Instance Name:
- Make sure the SQL Server instance name is correct in the connection string.
- Check the connection string format:
Server=[ServerName\InstanceName];Database=[YourDatabaseName];Integrated Security=True;
.
-
Firewall and Network Configuration:
- Ensure that the firewall on the SQL Server is not blocking the connection.
- Open the necessary ports (default is 1433 for SQL Server).
-
SQL Server Authentication:
- Ensure that SQL Server is configured to allow remote connections.
- Open SQL Server Management Studio (SSMS).
- Right-click on the server instance, select
Properties
, go to theConnections
tab, and check "Allow remote connections to this server".
-
Check SQL Server Error Logs:
- Open SQL Server Management Studio.
- Go to
Management
->SQL Server Logs
and check for any related error messages.
-
Reboot the Server:
- If changes have been made to the SQL Server configuration, a reboot may be necessary for the changes to take effect.