For a training I installed a WebCenter Suite environment on an Oracle Enterprise Linux.
I ran into two problems. First I couldn't start the AdminServer. The logfile told me that the JDBC to mdsSpaces failed due to a Socket time out. Took me some time to realize this, but the reason was that I had configured the VirtualBox with a DNS (on the Windows host). Therefore the JDBC calls went out to seek for the database - which timed out.
The second issue I had (and still have) is that after starting the NodeManager and AdminServer I couldn't start the WC_Spaces Server from inside the WebLogic Console. I have no solution for this yet, only a work-around. When I start the WC_Spaces from the commandline as a Managed Server it works.
If somebody has an idea why this happens, obviously I'd like to hear from you.