How to fix phpmyadmin authorization error?

Question

PHP

Good afternoon!

I installed half a year ago on a clean server under Ubuntu 16.04 VESTA, which itself delivered MySql and phpMyAdmin. Not so long ago I installed PostgreSql and phpPgAdmin myself. Everything was fine, I used both.

At one point, I could not log in to phpMyAdmin, I got a 500 error during authorization. There was an entry in the log that access to [email protected] using a password was denied. I threw off the password for root, set a new one, the error went away. But another one appeared: now, when authorizing, the page reloads, authorization data (token) appears in the GET parameters, but I find myself again on the authorization page (that is, the authorization page simply reloads).
There are no errors in the logs.

The rights to the folder with sessions are 777, the time on the server is set correctly. Moreover, if I log in through TablePlus, then authorization works and I can view the database.