Sierra desktop client install - java error

Installing the new Sierra java client for our Innovative Interfaces OPAC was easy, just use this URL


http://your.iii.server.com/sierra/desktop

but in some computers (about a quarter) gave the following java error:

"Gadget needs Java click here to install"  and just had a general link to java.com website.

This link worked in starting the java machine install:

http://iii.server.name/web/gadgets/sierraDesktopApp/noWebStart/Web_Installers/install.htm 

Important:

When running install for Sierra, use domain name (eg  iii.yourservername.edu) instead of IP address.

Sierra does not work if use IP address for the Innovative Server address, use domain name instead.


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Note:

See comment below,  John H has suggested that adding your server URL to  Compatibility View Settings in Java Security settings will solve this problem.