Hi,

You may enable the forwarding of the cookies to the Metadata Adapter, setting to 'Y' the <forward_cookies> configuration element in the SECURITY CONFIGURATION section of the lightstreamer_conf.xml file.
If set to 'Y', the cookies are forwarded to the Metadata Adapter through the httpHeaders argument of the "notifyUser" method.
But keep in mind that, as stated in the notes, you should also set to 'Y' the <use_protected_js> configuration element, because otherwise you may expose the server to CSRF attacks, and you should also configure the <cross_domain_policy> element with a less permissive rule.

hth
Marco