Symfony - Logger Setting and Enable

Enable File apps/YOUR_APP/config/factories.yml

prod:
  logger:
   class: sfNoLogger     param:
     level: err
     loggers: ~

to

prod:
  logger:
   class: sfFileLogger
    param:
     level: debug
     loggers: ~
     file: %SF_LOG_DIR%/%SF_APP%_%SF_ENVIRONMENT%.log

Enable symfony debugging apps/YOUR_APP/config/setting.yml

prod:
  .settings:
   no_script_name: true
   logging_enabled: false # Please change to "true"

Reference: Ticket
Application-Management-Tools