Archive Logs Are Not Copied To Standby solve issue from scratch

I debug this same issue at least once a week since May 2009 :), below step help to solve issue from scratch
We usually find below erro message on alert logfile.

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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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Check:

That you are using password files
That the name of the password file is $ORACLE_HOME/dbs/orapw${ORACLE_SID}
That the password of sys is the same on all the servers involved in the archive copy
If one of the databases is 11g, make sure you set sec_case_sensitive_logon to false
Also check that you created the password file with ignore_case=y
I think this covers my usual debug process.


Never forget  11g has  case sensitive passwords.