In my customer Data Guard environment , rman backup use ZDLRA bi-directional architecture, both the primary and the standby databases are registered with the catalog. Standby db DB_STBY1 connect to RA_stb catalogPrimary db DB_PRI1 connect to RA_pri catalog. The databases are distinguished using the DB_UNIQUE_NAME in rman configuration. CONFIGURE DB_UNIQUE_NAME ‘DB_PRI1’ CONNECT IDENTIFIER ‘DB_PRI1’; CONFIGURE DB_UNIQUE_NAMEContinue reading “ZDLRA, ORA-17629: Cannot connect to the remote database server”