When having pair of Exinda appliances working as master and standby units, the access to the master was lost. It's not possible to login to the Master Exinda due to a forgotten password.
When executing CLI commands
sh cluster master and
sh cluster standby from the standby unit, both Node States appear as Online.
Because of the password issues, it's needed to swap the Master/Standby appliances.
In order for the Standby appliance to become a Master, the change which appliance is the master should be done.
As step 1 "Turn clustering off on the appliance that is currently the master" is not possible due to lost Master access for WebUI and SSH, there is no way to force changes without physically rebooting (power-cycle) Master. This way the Master will automatically handover connections to the Standby unit.