Hello, I have an ipv6 site http://beatrixkanaal.openremote.nl which is configured through an ipv6 tunnel. Some clients needs to access it from ipv4 as they don't have ipv6 yet (e.g. Gemeente Eindhoven). I've gave them the gateway address http://beatrixkanaal.openremote.nl.ipv4.sixxs.org which is working except for POSTing data. I've narrowed it down to the fact that when my app is POSTing Content-Type: application/json then I get back server error 500 complaining org.glassfish.jersey.server.ContainerException: java.io.EOFException: No content to map to Object due to end of input I am able to pass through the data when using a fake header Content-Type: application/x-www-form-urlencoded but then the another problem arises - all spaces are replaced by underscores. Therefore this workaround isn't 100% workable. All these problems are caused by the ipv4.sixxs.org gateway. When I access the site directly on ipv6 everything is OK. Kind regards, Michal Rutka, PhD