HTTP 404 on Vaadin 7 when accessed through a Juniper Secure Gateway

Hello,

Some requests from the client succeed through Juniper while others cause a HTTP 404 response.
There is already a ticket referenced by# 11482. with this same problem (http://dev.vaadin.com/ticket/11482)
This ticket was closed 13 months ago. Since then, have you other information that could be useful to unblock this issue ?

Thanks in advance.