Ivms4200 NVR streaming media server how to realize the remote preview, playback, control-CodePudding

NVR
IP: 192.168.1.249-253
The HTTP port: 80-84
RTSP port: 554
Service port: 8949-8953
Streaming media server management (computer)
IP: 192.168.1.246
Port 554
Ivms4200 (and streaming media server on a single host installation, the ipc to streaming media server)
IP: 192.168.1.246
The HTTP port: 8080
Mapping out the port
192.168.1.249:80.8949
192.168.1.250:81.8950
192.168.1.251:82.8951
192.168.1.252:83.8952
192.168.1.253:84.8953
192.168.1.246:554
192.168.1.246:12000-20000
In the management of computer 4200 access can be normal from the streaming media server to leave
Outer net HTTP access can also be normal from the streaming media server to leave
But the outer net 4200 access to can't from the streaming media server leave how to solve?