Hello,
assuming that your Lightstreamer is deployed on server1.is.mycompany.com on port 8085, the code seems correct.
Where is deployed your page?
How do you acces your page (what is the address in the browser's address bar)? It should be something like webserver.mycompany.com
Please take a look to these pages:
http://www.google.it/search?q=%22unable+to+find+the+engine%22+site%3Awww.lightstreamer.com