You see the same problem with http://YOURSERVER:9502/obiee/javads?status.
I had this problem on Windows server. probably exists on other platforms as well.
Logon to the weblogic console (in my case http://MYSERVER:9500/console)
Find there obi.datasrc.server
Find the Target tab,
Press Lock & Edit
enable bi_cluster (leave the bi_internal_virtualhost1 for next step)
Press Lock & Edit again
disable the bi_internal_virtualhost1
Activate Changes again.
(I got an error trying to do both in one step).
Now it should work: