Hi salat,

So you can replicate the issue in two very different scenarios:

1. LS_server <-> Load Balancer <-> Physical machine client
2. LS_server <-> Virtual machine client (on the same box of the server)

This puzzles me a lot, since the latter case is very similar to my test except for the type of virtualizer.
If you can replicate the test it would be appropriate to gather the server log, after setting the logger "LightstreamerLogger.connections" at INFO level. And even more useful would be to cross the log information with a network packet sniffing.

You can also send these info to support.

Thank you.