If the connections are empty, that means broker servers are not connecting to the mirror server database, most common problem is database security in mirror server. . Open the Remote Desktop Licensing Manager from. A network-related or instance-specific error occurred while establishing a connection to SQL Server. . Incoming remote desktop connection handled by RD Connection Broker RD Connection Broker decides which RD Host server to send the incoming connection. Hi, Please ensure that the SQL Instance is running and required firewall ports are open on the SQL server. . 4. . To open Server Manager, click Start, point to Administrative Tools, and then click Server Manager. .