Hi

It is quite unusual that a connection is in a SYN_SENT state.
Is it possible that a local firewall is blocking packets back from Lightstreamer Server to the Remote Server?
Can you also see the 6663 port as open for listening? (I assume that you are running both Lightstreamer Server and the Remote Server on the same machine).
What can you see on Lightstreamer Server log? You should find it as logs\Lightstreamer.log

Dario