[Nut-upsuser] problem starting upsd

[James]

$ sudo /usr/sbin/upsd -DDDD
Network UPS Tools upsd 2.4.3
   0.000000     listen_add: added ::1:3493
   0.000084     listen_add: added 127.0.0.1:3493
   0.000102     setuptcp: try to bind to 127.0.0.1 port 3493
   0.000185     listening on 127.0.0.1 port 3493
   0.000204     setuptcp: try to bind to ::1 port 3493
   0.001328     setuptcp: socket: Address family not supported by protocol
   0.001381     not listening on ::1 port 3493

$ sudo upsc -L
Error: Connection failure: Connection refused