Hi, I guess I do have still this Issue here: https://git.ispconfig.org/ispconfig/ispconfig3/issues/3827 The issue existed on Debian 8 and even on 9, no matter which PHP Version I use. My current szenario has FastCGI. It is not related to ISPConfig backend, but for example login into Wordpress or REDAXO CMS. I dont know if this is a redirect http to https Issue. When I watch the response and request headers, I can see two PHPSESSIDs which will prevent me from loggin in. Every PHP Setup is totally default. I need to restart my browser (firefox or chrome, bug exists on both) in order to be able to log in.