Setting aluIpTransportRemHostCheckTcp to 'doAction' causes a check TCP connection test to be initiated. The process is much like that of a regular TCP connection attempt except that: - only a single attempt is made - it has a fixed timeout period of 5 seconds - upon success, the connection is torn down immediately If a TCP connection is already established, no test is initiated and aluIpTransportRemHostCheckTcpRes will indicate an immediate pass result. If a TCP connection test is already in progress, the request is ignored.