| ERROR | broker protocol version mismatch detected |
| CAUSE | A network protocol version number mismatch was detected. This could happen if the databases in the broker configuration were not running the same version of Oracle. The broker would disable standby databases that were not running the same version of Oracle as the primary database if this situation was detected. |
| ACTION | Examine the version of Oracle installed on all databases in the broker configuration to ensure they are identical. Once all of the datbases in the broker configuration are running the same version of Oracle, reenable the standby databases that were disabled. |