The current version of Receiver for Java (10.1) will no longer function on any end point that installs Java 7 update 51 ! Installing the Receiver for Java 10.1.007 update will avoid issues.
Please note comments from Mallikarjun Dandoti below regarding use with HTTPS only!
The update can be found here.
Here is the back story. Oracle will release Java 7 update 51 in January, 2014, with two security changes designed to enhance authentication and authorization for Rich Internet Applications. The default security slider is being updated in a way that will block Rich Internet Applications that do not adhere to new requirements. See details here.
While the Receiver for Java (ICA client) is beyond End of Maintenance, the Citrix Lifecycles Management Team released this update to provide customer more time to migrate to Receiver for HTML5.
Administrators should update the Receiver for Java client to avoid issues. A good option is to expedite transition to Receiver for HTML5. Receiver for HTML5 offers an improve user experience, support for more types of end points, and will include new features over time. It’s available for use with StoreFront in conjunction with several versions of XenApp and XenDesktop and is also available for use with VDI-in-a-Box.
Let us know of any issues.