I have successfully installed OEM 12c on RHEL6, it is a 3-node using F5 Big IP SLB. OMS is up and running on all three nodes, however the OEM console shows three targets to be down on the first node as seen below.
The same three targets are reported up on node2 and node3.
I ran ./emctl status oms -details on all three nodes and the results are the same.
It looks like a false alarm to me. Any ideas?