The “Returned an Unexpected Error” error message is logged in the NexOSS log file.
Error: The Server Has Returned an Unexpected Error. /Not in GZIP Format
Try to to disable the “Keep temporary files on my computer” option in the Java Applet Viewer by:
Opening the “Java Control Panel” on the PC
Selecting the “General” tab
Clicking on “Settings” under the “Temporary Internet Files” section
Un-checking the “Keep temporary files on my computer” check box.
Close the control panel and all web browser windows.