Error: ORA-16883: unable to translate DGConnectIdentifier property

DGMGRL> show configuration;
Configuration - dg_tst1t
Protection Mode: MaxPerformance
Members:
tst1tp - Primary database
    Error: ORA-16778: redo transport error for one or more members
    tst1ts - Physical standby database
      Error: ORA-16883: unable to translate DGConnectIdentifier property
DGMGRL> show database tst1ts
Database - tst1ts
Role:               PHYSICAL STANDBY
Intended State:     APPLY-ON
Transport Lag:      (unknown)
Apply Lag:          (unknown)
Average Apply Rate: (unknown)
Real Time Query:    OFF
Instance(s):
    TST1T
Database Status:
DGM-17016: failed to retrieve status for database "tst1ts"
ORA-16883: unable to translate DGConnectIdentifier property
ORA-16625: cannot reach member "tst1ts"
DGMGRL> show database tst1ts DGConnectIdentifier
DGConnectIdentifier = 'tst1ts'
DGMGRL> show database tst1tp DGConnectIdentifier
DGConnectIdentifier = 'tst1tp'
Cause:
Dataguard Broker is not able to identify the DGConnectIdentifier.
Solution:
To resolve the issue check and fix following.
1> check that the tnsentries are present in both primary and standby database server and are correct
2> Perform tnsping from both primary and standby
$tnsping tst1ts
$tnsping tst1tp
3> Check if local_listener is configured and if yes its entry in tnsnames.ora exists and is configured correctly
4> Verify on both primary and standby that the listener is listening for the service configured in tnsnames.ora
5> If the above is correct just disable and enable the configuration.

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