| ERROR | 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. |