after some digging, the issue seems to be related to the URL redirection.
Our webserver have an url rewritting script which add the www when the user didn’t put it.
however we have put the www in our url.
so I think there is some kind of issue in this code handling the redirection as windows handles it correctly.
still I don’t know what precisely.
maybe just like on windows, there is some code handling high level concept like http in cocoa which will solve this kind of issues ?
In the meantime, we have remove the URL rewriting, so it works.
So unfortunately, you no more can test with this URL