The SQL Server is installed on a different server than the MAgE (Migration Agent for Exchange) agent.
The MAgE agent is not connecting to the SQL server and the following error is displayed in the log.
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: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)