HA in Stealth mode worked fine, but when activating the configuration the first time after setting up, there are the following error messages on the console:
....
qfe2: screen module pushed
qfe3: screen module pushed
Original ether addr: 8:0:20:9d:c7:be.
Setting new enter addr: 8:0:20:9e:e0:66.
Error: SIOCGIFFLAGS
: No such device or address
Jun 18 19:47:59 u5 ss_had[1291]: Error: SIOCGIFFLAGS
Jun 18 19:47:59 u5 ss_had[1291]: Error: No such device
 or address
Error: SIOCGIFFLAGS
: No such device or address
Jun 18 19:48:00 u5 ss_had[1291]: Error: SIOCGIFFLAGS
Jun 18 19:48:00 u5 ss_had[1291]: Error: No such device
 or address
Error: setting ethernet address
EFS HA host entering PASSIVE mode.
High Availability daemon started