Error: Server Error on Security Pages
The following error is sometimes seen when security settings from a previous install don't get carried over correctly during an upgrade.
Resolution
To resolve this error:
Stop Voyager
Make a copy of the security.dex file as backup
Edit security.dex and manually remove the Windows realm
Restart Voyager, login using internal authentication (default should be set to admin/admin)
Turn on on Windows Authentication
Click Configure and then the Groups tab to check if groups are now listed correctly
NOTE: This method may require admin users to re-register their Windows groups on Voyager (under Groups > Register tab).