A survivable core server registers with the main server. Under normal conditions a survivable core server may not register with the main server if the survivable core server is resetting. The survivable core server resets when it receives a new translation file or when it is first enabled. This should be a temporary condition.
See Maintenance Commands for Avaya Aura® Communication Manager, Branch Gateways and Servers for errors related to survivable core server registration. Error 257 should be logged when a survivable core server is administered on the main server but is not registered.