Você está executando qualquer coisa que forneça um serviço durante o dia? De Wikipedia :
On UNIX-like operating systems a daytime server is usually built into the inetd (or xinetd) daemon. The service is usually not enabled by default. It may be enabled by adding the following lines to the file /etc/inetd.conf and telling inetd to reload its configuration.
daytime stream tcp nowait root internal
daytime dgram udp wait root internal
Assim você tem que habilitar o serviço diurno no inetd.conf.