While accessing a .aspx page on IIS through WAF ( https ) there will be no pictures in the Interface.
The site also loads a jscript.
With DNAT everything works fine.
In the resulting page the pictures show up with the internal ip of the webserver in the page ( gernerated by jscript ). The IE then tries to load the pitures and fails.
In the DNAT version the links to the pictures are correct and have the external name in the URL.
