Solution:
Perle recommends that all uses upgrade to the new version 6 of Trueport for Windows. A new management interface has been added for easier control for Adding/Removing and Configuring your Trueport virtual COM ports.
Note: New version 3 firmware for the Iolan Device Server has added a new Trueport line service.
Upgrade to the latest v3 of the Perle Device Manager and Perle Iolan Device Server firmware.