Hello,
I've tried the demos from outside the local LAN.
I've used a PC with Windows 2000 5.00.2195 service pack 4 updated with the latest updates available with windows update.
The browser is IE:
Version: 6.0.2800.1106
Update Versions:; SP1; Q822925; Q330994; Q828750;
Q824145; Q823353; Q833989; Q903235;
With this environment the three demos are working correctly, can you see any difference with your environment?

Yes, version 4.2.2 is the latest available. A demo with that version is available here: http://app.lightstreamer.com/StockListDemoA/