Thank you for posting.
It appears to be a file permissions issue given the error: "The current user does not have write access to the cache". It is most likely referring to the cache under:
Repairing disk permissions with Utilities > Disk Utility or deleting the Java cached files under Utilities > Java Preferences > Network could potentially resolve this error.
As another option, try running the .jnlp file from the Terminal as the superuser with the following sequence of commands:
ftp http://127.0.0.1:16000/admin_console_init_webstart.jnlp # Download the file
sudo javaws admin_console_init_webstart.jnlp # (Enter your password)
As a final workaround, the Admin Console can be launched from another machine as long as ports 16000 and 16001 are opened on the server. From a local machine on the network simply go to:
Please let me know if any of these options help.
Neither Disk Utility file permissions repair nor Java cache file deletion helped. It does work accessing from another machine via http://serverIP:16000 . Apparently, there were two users on the server.... one: the original admin account user and the other created for misc testing.... I logged out of the second account and logged in as the original and it seems to work fine.
However, since we had a lot of disk permission repair files ... I ended up reinstalling the whole setup from scratch all over again. The end result is that it all works fine.
Thanks for the help.