Problem description:
Error 1017 received logging on to the standby————————————————————

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

————————————————————

PING[ARC2]: Heartbeat failed to connect to standby ‘pandb_dg’. Error is 16191.
Solutions:
1. Change the password once for both RAC1 and RAC2 nodes.
SQL> Alter User sys identified by sys;
2. The rac1 and regenerate the password file:
orapwd file =/u01/app/oracle/product/11.2.0/db_1/DBS/orapwpandb password = sys force = y ignorecase = y
the password file copy to the standby server side, and rac2.
problem solving.