I am assuming you configured the proxy settings on windows of LG properly, so can you ping/telnet the MiListener to the port 443 from the LG? When you add it you use the Machine key and not the actual name of the LG machine, and it will be added but this makes no verification this is dummy, until the test is about to start it actually checks on that, so the fact that youc an add it to controller doenst mean it is reachable.
check on that and let us know
regards
check on that and let us know
regards