Theory Ok, Gary, I understand. But shared hosting settings cannot be changed. And for a user it doesn't seem to be like a hosting error, but an application. Because all the other CMS are working there. My opinion is that it's not good idea to force a user to change his hosting where he can run anot...

That's not so much ...ehhhm... user friendly :lol: I just remembered a time when website developers advised users what their browser and resolution should be :D Not to be only sarcastic I've spent tonight trying to find a solution. I like the installation process, it's quick and easy. But such a UX ...

Thank you @ecartz for your response. And what are the request headers? Are they the same on every invocation of login.php? Or are they toggling between two values? Headers screenshot is attached. Headers are same for all login.php (except for red one which is just before browser's ERR_TOO_MANY_REDIR...

CE Phoenix 1.0.7.11, PHP 7.4.13 I have the same issue on admin page using subdomain eshop .example.com Subdomain folder is located at www/subdom/eshop It works fine if it's placed to the root www/. But there is located different CMS and I have to put Phoenix to the subfolder and set up it as a subdo...