I have updated Piwik from 1.12 (yep, very old) to 2.4.1 by extracting the new version from latest.zip, copying my config.ini.php, setting owner/group to Apache and then running the SQL commands via SQLyog.
The same workflow has been used multiple times before, so there should be no problem with that. Piwik site is showing the new layout, but I cannot login: “username or password are not correct” (translated from German).
I have tried using the instructions from How do I change the Super User's password when password recovery emails are not sent? - Analytics Platform - Matomo but none of them worked. First I tried the pre-2.1-version using config.ini.php but I still got the same error message. Then I added a new admin user into the user table. There was no admin user before. Should Piwik have migrated the admin user from config.ini.php into a database entry? Whatsoever, still didn´t work.
When I use the “forgot password” function, Piwik tells me that either username or email-address are invalid. But that´s the username from config.ini.php and the email-address is correct, too.
I couldn´t find any errors in php.log oder apache´s error.log.
What might be the problem? Where can I find more info?