ORA-16191: Primary log shipping client not logged on standby

Once I have changed the password of the primary database and find everything is working fine. Logs are applied on standby and sychronization between primary and standby database is fine . On next day when i restarted my standby database and find that the redo logs are not applying on the standby database . When I checked the alert log file then found the below error message.

Error 1017 received logging on to the standby
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Check that the primary and standby are using a password file and remote_login_passwordfile is set to SHARED or EXCLUSIVE, and that the SYS password is same in the password files.
 returning error ORA-16191
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FAL[client, ARC0]: Error 16191 connecting to noida for fetching gap sequence
Errors in file d:\app\stand\diag\diag\rdbms\delhi\delhi\trace\delhi_arc0_2308.trc:
ORA-16191: Primary log shipping client not logged on standby
Errors in file d:\app\stand\diag\diag\rdbms\delhi\delhi\trace\delhi_arc0_2308.trc:
ORA-16191: Primary log shipping client not logged on standby
Dictionary check complete

After some troubleshooting and googling, I came to conclusion that this error occurs because of the invalid user credentials while attempts to ship redo to standby database .

To solve this issue we have copy the primary password file to standby database and rename the password file. Once the password-file is copied  and renamed on  standby database then stop and resatrt the recovery to make password-file in use. The below command will stop and restart the recovery .

1.) Log into standby database and stop the recovery as
SQL> alter database recover managed standby database cancel;

2.)  Now restart the recovery as
SQL>alter database recover managed standby database disconnect from session ;

Perform a log switch on the primary database and check the archive sequence ,archive destination  and alert logfile. 

Enjoy    :-)