| ERROR | Missing the account (string) specified by DEFAULT_USER_ACCOUNT in SID_DESC |
| CAUSE | The unprivileged OS account is missing from /etc/passwd. |
| ACTION | Check the DEFAULT_USER_ACCOUNT parameter in the SID_DESC in LISTENER.ORA and verify it has a valid entry in /etc/passwd. This is the account that the Oracle shadow process will be started with if the the connecting client has database privileges or does not exist on this machine. |