jnlp (Java Network Launching Protocol) does not run from IE, only prompts to save

If you’re running a secure network, you may encounter a situation where you try to launch a Java web app (from an SSL session) and instead IE will only give you the option to save the jnlp file.  Assuming that your JRE version is current, this is likely due to the following Group Policy being enabled:

Computer Configuration | Administrative Templates | Windows Components | Internet Explorer | Internet Control panel | Advanced Page | Do not save encrypted pages to disk

This causes IE to block saving the jnlp file to the cache, which also precludes it from launching.

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