Hi man  check  her ,     view   /var/log/messages :  
this  is  my logs  :
Jan  7 15:11:31 _net avahi-daemon[4888]: Successfully dropped root privileges.
Jan  7 15:11:31 _net avahi-daemon[4888]: avahi-daemon 0.6.16 starting up.
Jan  7 15:11:31 _net avahi-daemon[4888]: WARNING: No NSS support for mDNS detected, consider installing nss-mdns!
Jan  7 15:11:31 _net avahi-daemon[4888]: Successfully called chroot().
Jan  7 15:11:31 _net avahi-daemon[4888]: Successfully dropped remaining capabilities.
Jan  7 15:11:31 _net avahi-daemon[4888]: Loading service file /sB! 4ervices/sftp-ssh.service.
Jan  7 15:11:31 _net avahi-daemon[4888]: New relevant interface eth0.IPv6 for mDNS.
Jan  7 15:11:31 _net avahi-daemon[4888]: Joining mDNS multicast group on interface eth0.IPv6 with address fe80::20d:9dff:fe5
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