If an error occurs when opening a website in a browser ERR_CONTENT_DECODING_FAILED, the reason could be the inclusion of gzip compression in adminpanels the site itself. Since the compression on the hosting enabled by default, enabling compression on the site results in the data being compressed twice, which prevents the browser from unpacking it.

To fix the situation:

  1. V config file site, look at the name of its database.
  2. Open the site database in phpMyAdmin.
  3. Find in the table oc_setting string with value config_compression in column key... To do this, you can execute such a SQL query:
    SELECT * FROM `oc_setting` WHERE `key` = 'config_compression'
  4. Set in the found string to 0 in column value.
  5. Check the site is working.