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I verified it with virt-viewer-2.0-17.el6.x86_64. Steps: 1. Prepare a guest and a ini file and set the "usb-filter=-1,-1,-1,-1,0" to forbid any usb device. # cat b.ini [virt-viewer] type=spice host=localhost port=5900 enable-usbredir=1 enable-usb-autoshare=1 usb-filter=-1,-1,-1,-1,0 2. Run "remote-viewer b.ini" to connect to the guest. 3. Plug a usb device into the host device. Acutal Result: No usb device pops up in the guest. then modifiy usb-fileter to "usb-filter=-1,-1,-1,-1,1", open the guest and plug a usb device again. The usb device can pop up successfully. So it is fixed and move it from ON_QA to VERIFIED.
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://rhn.redhat.com/errata/RHBA-2017-0587.html