Opencart is one of the best CMS for e-commerce, conveniently simple and feature-rich, for which having free disk space is vital.
Let’s deal with such a problem, when you can not enter the admin panel of the site.
When entering login and password (correct data) only reload the page and change the hardware token in the page url, and when trying to recover password nothing happens at all. At the same time everything works fine on the server, and everything is also fine with the site files. There were some assumptions about the browser, but even here all attempts were in vain.
After some more manipulations with the site, the problem turned out to be trivial – insufficient free space on the server. Literally all disk space was filled to 100%, and only after freeing some of it, everything worked.