jquery $.ajax() post to ASHX file and lost session variables

jquery $.ajax() post to ASHX file and lost session variables

I am posting, via .ajax() to a an ASHX file which is unable to retrieve session scoped variables -- even when I implement the class using IReadOnlySessionState

Is this due to the AJAX post not containing cookie with the session id in it?

is there a way to ensure that this data gets to the ashx?  I dont want to have to pass in the data via the ajax call itself (ie form captcha verification)

any help would be great.

thanks,