New actiontec disables MOCA bridge

I recently upgraded from a nim-100 and Linksys router combination to the all-in-one Actiontec cable modem MI424-WR Rev F.

Elsewhere in the house, I also had a NIm-100 connected directly to COAX in order to provide direct internet to a PC. 

Although the device is visible via the Actiontec control panel at, it indicates that the Nim-100 connected via COAX is "cable disconnected".

The status is shown below.  How do I fix this?

Status:Cable Disconnected
Network:Broadband Connection
Connection Type:Coax
MAC Address:xxxxxxxxxxxxx(hidden)
IP Address Distribution:Disabled
Channel:Cable Disconnected
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