Thanks but sorry i wasn't clear. I don't want to force https, but rather have the option to use https. Therefore there shouldn't be any specific definition of http nor https anywhere. Still i tried to put https in the XOOPS_URL and it still seems to be OK when using http and the page is not malformed anymore when using https, so maybe that is the solution. Still there are some content like images transferred over http so i will look into that later

We are using XOOPS 2.5.4 on our site with Apache/2.2.15. We already have SSL certificate installed, and SSL login is enabled and works fine. However, if we try to browse the site using https address, much of the site is malformed and the content is still delivered via insecure http. I am wondering if there is a module or method to enable the use of HTTPS for the entire site? Or is this some configuration problem in apache ssl.conf?
Thanks