I have the same system specs and the same problem (my Mac Mini is running 10.8.5 Server). I can't get the console page to load. I have the Mountain Lion adaptive firewall turned off, so I assume that's not the problem.
I also tried installing a trial version of Filemaker 10 Advanced Server, but the console page doesn't load on that either.
Paula Mamdouh & Bill Eben:
Thank you for the post and reply.
I am able to launch the FileMaker Server 12 (Advanced) Admin Console on Mac OS X 10.8.5 with Java 7 Update 40.
If the FileMaker Server Start Page is not loading, then first test to see if Java is working:
If the FileMaker Server Start Page loads, then do you see any indication that a Java applet is being downloaded?
Note: In Safari choose View > Show Downloads.
Do you see any .jnlp files? If yes, then does a double-click launch the applet?
Lastly, browser security settings may vary, could you try another web browser (FireFox, Chrome) to see if the results are the same?
I contacted Filemaker support and got it working. The key was to clear out the Java cache before launching.
Thanks @Bill Eben, I've tried clearing Java cache, but it didn't work either.
I've followed the suggestion to use a different browser as @TSFalcon suggested. Chrome didn't work at all, since it doesn't support Java (for some reason!). I ended up with FireFox, and it worked fine just as expected.