EMG3525-T50B Port Forwarding / NAT not working

 Hi, when trying to setup NAT on the new 
EMG3525-T50B router (Firmware V5.50(ABPM.2)R0) it constantly gives the error "FORBIDDEN - The request was forbidden". 
It is a simple port forward from 9870 to 37777 for a IP DVR Camera system, which works seamlessly on TP-Link and other routers. 
Put start port & end port as 9870 (only one port) and translation start and translation end ports as 37777 with the Server IP address as the DVR internal IP. 
What's the secret to the overly complicated port ranges?

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