The pattern is strange, because the first attempt fails in 8 seconds, the second one fails immediately, then the subsequent ones fail after 30 seconds (which is the default connection timeout).

If you can replicate the issue locally, please expand the log, by configuring the level for the "com.lightstreamer.ls_proxy.connection", "com.lightstreamer.ls_client.session", and "com.lightstreamer.ls_client.stream" loggers as FINER, then attach the log.
This should clarify what happens during the connection attempts.