ORA-16191
        log shipping client unable to log onto target database
        
        
        Cause
        An attempt was made to ship redo to a target database without logging on to standby or with invalid user credentials.
        Action
        Ensure that the primary and target databases are using password files and that both the primary and target databases have the same SYS password. After ensuring that the password file is accessible and the REMOTE_LOGIN_PASSWORDFILE initialization parameter is set to either SHARED or EXCLUSIVE, restart the primary or target database or both.
        
     
    
    
        ORA-16191
        Primary log shipping client not logged on standby
        
        
        Cause
        An attempt to ship redo to standby without logging on to standby or with invalid user credentials.
        Action
        Check that primary and standby are using password files and that both primary and standby have the same SYS password. Restart primary and/or standby after ensuring that password file is accessible and REMOTE_LOGIN_PASSWORDFILE initialization parameter is set to SHARED or EXCLUSIVE.
        
     
    
    
        ORA-16191
        Primary log shipping client not logged on standby
        
        
        Cause
        An attempt to ship redo to standby without logging on to standby or with invalid user credentials.
        Action
        Check that primary and standby are using password files and that both primary and standby have the same SYS password. Restart primary and/or standby after ensuring that password file is accessible and REMOTE_LOGIN_PASSWORDFILE initialization parameter is set to SHARED or EXCLUSIVE.