Sessions do not seem to work correctly on your server.
Make sure the variable "session.save_path" is set correctly in your PHP config, and that you have write access to it.
It currently points to /var/lib/php/sessions.
On some browsers, accessing your server via a hostname like 'localhost' or any custom hostname without a dot causes cookie storage to fail. We recommend accessing your server via it's IP address or Fully Qualified Domain Name.

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