решение: надо перезапустить zentyal
$ sudo /etc/init.d/zentyal restart
* Stopping Zentyal module: squid [ OK ]
* Stopping Zentyal module: samba [ OK ]
* Stopping Zentyal module: bwmonitor [ OK ]
* Stopping Zentyal module: asterisk [ OK ]
* Stopping Zentyal module: users [ OK ]
* Stopping Zentyal module: trafficshaping [ OK ]
* Stopping Zentyal module: openvpn [ OK ]
* Stopping Zentyal module: monitor [ OK ]
* Stopping Zentyal module: logs [ OK ]
* Stopping Zentyal module: ipsec [ OK ]
* Stopping Zentyal module: ids [ OK ]
* Stopping Zentyal module: events [ OK ]
* Stopping Zentyal module: ebackup [ OK ]
* Stopping Zentyal module: dns [ OK ]
* Stopping Zentyal module: dhcp [ OK ]
* Stopping Zentyal module: ca [ OK ]
* Stopping Zentyal module: audit [ OK ]
* Stopping Zentyal module: antivirus [ OK ]
* Stopping Zentyal module: firewall [ OK ]
* Stopping Zentyal module: network [ OK ]
* Stopping Zentyal module: apache [ OK ]
* Starting Zentyal module: network [ OK ]
* Starting Zentyal module: firewall [ OK ]
* Starting Zentyal module: antivirus [ OK ]
* Starting Zentyal module: audit [ OK ]
* Starting Zentyal module: ca [ OK ]
* Starting Zentyal module: dhcp [ OK ]
* Starting Zentyal module: dns [ OK ]
* Starting Zentyal module: ebackup [ OK ]
* Starting Zentyal module: events [ OK ]
* Starting Zentyal module: ids [ OK ]
* Starting Zentyal module: ipsec [ OK ]
* Starting Zentyal module: logs [ OK ]
* Starting Zentyal module: monitor [ OK ]
* Starting Zentyal module: openvpn [ OK ]
* Starting Zentyal module: trafficshaping [ OK ]
* Starting Zentyal module: users [ OK ]
* Starting Zentyal module: asterisk [ OK ]
* Starting Zentyal module: bwmonitor [ OK ]
* Starting Zentyal module: samba [ OK ]
* Starting Zentyal module: squid [ OK ]
* Starting Zentyal module: apache [ OK ]