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Reason
– Bad set “limit the burden on the system” or “Limit session.”
– NieusuniÄ™ty directory. / Install after the installation script.
RESOLUTION

Follow these instructions SQL:
UPDATE phpbb_config SET config_value =’3600 ‘WHERE config_name =’ active_sessions’;
UPDATE phpbb_config SET config_value =’0 ‘WHERE config_name =’ limit_load ‘;

Note!
After you follow these instructions do not forget to clear the cache!