ASA failover failure

Hi,

I have experiensed failover failure on the new instalation of pair of
ASA 5510 7.2(2). I use multi context mode but actualy in Active/
Standby mode. Only the reason fro multi context is the preemtion
option only supported in multiple mode.
The problem is that after restart of the primary/activ box it fall in
to state "failover off" or "could standby".
Only recovery procedu ..
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