rdesktop 64-bit fails with SmartCards - Red Hat Customer Portal

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Issue

A USB-attached SmartCard reader is recognized by the OS, but the token is not recognized in the rdesktop session.
The target of the rdesktop session is a virtual machine running Windows 7. The Windows 7 client does see activity when the device is connected or detached, and when a card is inserted or removed, but fails to recognize the token on the card, stating "No valid certificates found".
A 32-bit rdesktop binary works correctly, but not a 64-bit rdesktop.

Environment

Red Hat Enterprise Linux 6, x86_64
rdesktop-1.6.0-8.el6

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