AsyncFileUpload is not working with coockiless session as PostbackURL is going without appending session in URL. So, session_start event is getting execute when user trying to upload any document. Getting "server error" in response.
For now I have solved this problem by creating a dynamic postback url (protected variable in class file) and setting this dynamic URL for the control before starting the Upload but this should be handled in control itself.
Comments: I believe I am seeing this same problem with the latest version of this control (Oct 2013). The session is getting reset on file upload with cookieless sessions. Can you provide a code example of your workaround by chance? Thanks.
For now I have solved this problem by creating a dynamic postback url (protected variable in class file) and setting this dynamic URL for the control before starting the Upload but this should be handled in control itself.
Comments: I believe I am seeing this same problem with the latest version of this control (Oct 2013). The session is getting reset on file upload with cookieless sessions. Can you provide a code example of your workaround by chance? Thanks.