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try to compare PushPage and LightstreamerEngine configurations in the two cases; you should find some differences.
Is it possible that setLSHost and/or setLSPort are not configured correctly?

If...

please check the LS_HOME/pages/demos/HOW_TO_DEPLOY_ON_YOUR_WEB_SERVER.TXT file that explains how to configure a web application to run from an external web server

HTH