[ups][nut[ippon]Один из двух работает, по одному не хотят

Есть два ИБП Ippon, оба подключены через USB-COM переходник. Для них запущен nut:

• ups.conf
  

  [ippon1]
  	driver = megatec
  	port = /dev/ttyUSB1
  	desc = "Local UPS 1"
  [ippon2]
  	driver = megatec
  	port = /dev/ttyUSB2
  	desc = "Local UPS 2"
  

• upsd.conf
  

  ACL all 0.0.0.0/0
  ACL localhost 127.0.0.1/32
  ACCEPT localhost
  REJECT all
  

• upsd.users
  

  [user]
  	password = secret
  	allowfrom = localhost
  	action = SET
  	initcmds = ALL
  

• upsmon.conf
  

  MONITOR ippon1@localhost 1 user secret master
  MONITOR ippon2@localhost 1 user secret master
  MINSUPPLIES 1
  SHUTDOWNCMD "/sbin/shutdown -h +0"
  POLLFREQ 5
  POLLFREQALERT 3
  HOSTSYNC 15
  DEADTIME 15
  POWERDOWNFLAG /etc/killpower
  RBWARNTIME 43200
  NOCOMMWARNTIME 300
  FINALDELAY 5
  

Собственно - оно запустилось сначала нормально, затем я сделал перезапуск и вот такие проблемы:

1. Запускаем оба мастера для прослушивания и получаем ошибки в логах:
   

   Aug  1 15:40:15 services upsd[9115]: Can't connect to UPS [ippon2] (megatec-ippon2): No such file or directory
   Aug  1 15:40:15 services upsmon[9119]: Poll UPS [ippon2@localhost] failed - Driver not connected
   Aug  1 15:40:30 services upsmon[9119]:last message repeated 3 times
   Aug  1 15:40:30 services upsmon[9119]: UPS ippon2@localhost is unavailable
   Aug  1 15:40:30 services wall[10802]: wall: user nut broadcasted 1 lines (37 chars)
   Aug  1 15:40:35 services upsmon[9119]: Poll UPS [ippon2@localhost] failed - Driver not connected
   

   То есть, я могу посмотреть через upsc ippon1 информацию, а для ippon2 недоступна.
2. Запускаем только первый и получаем:
   

   Aug  1 15:42:50 services upsd[10884]: Startup successful
   Aug  1 15:42:50 services upsd[10884]: Read from UPS [ippon1] failed: Connection reset by peer
   Aug  1 15:42:50 services upsd[10884]: Can't connect to UPS [ippon1] (megatec-ippon1): No such file or directory
   Aug  1 15:42:50 services upsd[10884]: Data for UPS [ippon1] is stale - check driver
   Aug  1 15:42:50 services upsmon[10887]: Startup successful
   Aug  1 15:42:50 services upsd[10884]: Client user@127.0.0.1 logged into UPS [ippon1]
   Aug  1 15:42:50 services upsmon[10888]: Master privileges unavailable on UPS [ippon1@localhost]
   Aug  1 15:42:50 services upsmon[10888]: Reason: Access denied
   

3. Запускаем только второй:
   

   Aug  1 15:44:08 services upsd[10947]: Unrecognized user setting action
   Aug  1 15:44:08 services upsd[10947]: Unrecognized user setting initcmds
   Aug  1 15:44:08 services upsd[10948]: Startup successful
   Aug  1 15:44:08 services upsmon[10951]: Startup successful
   Aug  1 15:44:08 services upsd[10948]: Client user@127.0.0.1 logged into UPS [ippon2]
   Aug  1 15:44:08 services upsmon[10952]: Master privileges unavailable on UPS [ippon2@localhost]
   Aug  1 15:44:08 services upsmon[10952]: Reason: Access denied
   Aug  1 15:44:13 services upsmon[10952]: Poll UPS [ippon2@localhost] failed - Driver not connected
   Aug  1 15:44:13 services upsmon[10952]: Communications with UPS ippon2@localhost lost
   Aug  1 15:44:13 services wall[10954]: wall: user nut broadcasted 1 lines (47 chars)
   

   Не пойму почему одинаковым ИБП не подходят одинаковые драйвера
   и почему вдруг у моего пользователя нет прав для подключения.