But in the target page it will be shown as down with the below error
ORA-28040: No matching authentication protocol
The same occurs for ASM and cluster targets too.
This is because 126.96.36.199 OMS is certified to monitor only DB versions below 188.8.131.52.
1. For monitoring 12.2 DB and related targets, OMS needs to be at least of 184.108.40.206 release with 220.127.116.11 DB plugin.
2. If this issue occurs in 18.104.22.168 release too, ensure that the latest DB and Agent bundle patches are applied at the Agent.