Hello,
are you using Lightstreamer in Moderato or Allegro edition?
If so bandwidth management is not allowed
void setMaxBandwidth(<Number> maxBandwidth)
[...]
Edition Note: The request is ignored by the Server if it runs in Allegro edition (i.e. "UNLIMITED" is assumed).
Edition Note: The request is ignored by the Server if it runs in Moderato edition (i.e. "UNLIMITED" is assumed).
see
http://www.lightstreamer.com/docs/client_web_jsdoc/Policy.html#setMaxBandwidth for further details