Remote Control Tunnel Unresponsive [RESOLVED]
6300-CXs configured for IP Passthrough lose access to Remote Commands on 17.8 firmware
Available Workaround: Downgrade to 17.5 (available for download here)
Firmware Fix: 17.8.128.63 - November 9, 2017
RESOLUTION: Remote commands are once again available to devices provisioned for IP passthrough on firmware version 17.8.128.63 or later. Upon upgrading firmware, please give the remote control tunnel 10 to 20 minutes to rebuild itself.