Error :

Suppressing further error logging of LOG_ARCHIVE_DEST_2.
Fri Nov 6 08:45:53 2009
Error 1031 received logging on to the standby
Suppressing further error logging of LOG_ARCHIVE_DEST_2.
Fri Nov 6 08:50:53 2009
Error 1031 received logging on to the standby
Suppressing further error logging of LOG_ARCHIVE_DEST_2.
Fri Nov 6 08:55:53 2009
Error 1031 received logging on to the standby
Suppressing further error logging of LOG_ARCHIVE_DEST_2.
Fri Nov 6 09:00:04 2009
Thread 1 advanced to log sequence 15599
Current log# 1 seq# 15599 mem# 0: /DDMESP_home2/oradata/ORAPMES/redo1a.log
Current log# 1 seq# 15599 mem# 1: /DDMESP_home4/oradata/ORAPMES/redo1b.log
Fri Nov 6 09:00:53 2009
Error 1031 received logging on to the standby
Suppressing further error logging of LOG_ARCHIVE_DEST_2.
Fri Nov 6 09:01:24 2009
WARNING: inbound connection timed out (ORA-3136)
Fri Nov 6 09:01:32 2009
WARNING: inbound connection timed out (ORA-3136)

OR


Errors in file c:\oracle\product\10.2.0\admin\lims\bdump\lims_arc1_2756.trc:
ORA-01017: invalid username/password; logon denied

Sun Jul 20 05:08:19 2008
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


OR

*** 2008-07-20 21:47:24.812
*** SERVICE NAME:() 2008-07-20 21:47:24.781
*** SESSION ID:(156.1) 2008-07-20 21:47:24.781
Redo shipping client performing standby login
OCISessionBegin failed -1
.. Detailed OCI error val is 1031 and errmsg is 'ORA-01031: insufficient privileges
'
*** 2008-07-20 21:47:25.046 62692 kcrr.c
Error 1031 received logging on to the standby
Error 1031 connecting to destination LOG_ARCHIVE_DEST_2 standby host 'to_prod'
Error 1031 attaching to destination LOG_ARCHIVE_DEST_2 standby host 'to_prod'
ORA-01031: insufficient privileges
*** 2008-07-20 21:47:25.062 62692 kcrr.c
PINGARC1: Heartbeat failed to connect to standby 'to_prod'. Error is 1031.
*** 2008-07-20 21:47:25.062 60970 kcrr.c
kcrrfail: dest:2 err:1031 force:0 blast:1



Solution :

1. REMOTE_LOGIN_PASSWORDFILE configured to SHARED or EXCLUSIVE
2. Recreate the password file on the standby database to have the same sys password as the primary database.
OR
Copy the password from Primary server to the stnadby server