I have updated my mssql and all tools yesterday and it stopped working. Server itself seems to be fine but I'm not able to connect locally or remotely. sqlcmd -S localhost returns this: hyperqbe@slaro:/etc$ sqlcmd -S localhost Sqlcmd: Error: Microsoft ODBC Driver 17 for SQL Server : Login timeout expired. Sqlcmd: Error: Microsoft ODBC Driver 17 for SQL Server : TCP Provider: Error code 0x2749. Sqlcmd: Error: Microsoft ODBC Driver 17 for SQL Server : A network-related or instance-specific error has occurred while establishing a connection to SQL Server. Server is not found or not accessible. Check if instance name is correct and if SQL Server is configured to allow remote connections. For more information see SQL Server Books Online.. When I use IP the error is slightly different: hyperqbe@slaro:/etc$ sqlcmd -S 192.168.1.141 Sqlcmd: Error: Microsoft ODBC Driver 17 for SQL Server : TCP Provider: Error code 0x2746. Sqlcmd: Error: Microsoft ODBC Driver 17 for SQL Server : Client unable to establish connection.