smart pss offline

Hardwares: DVR Model: DH-XVR1B04-I connected to Internet via LAN cable to TP-Link Router. Camera Model: 3 pieces of DH-HAC-T1A21P dome camera and 1 piece of DH-HAC-B2A21P bullet camera. Problems: My dahua xvr is showing active on DMSS (blue color dot), but channels are showing offline (gray...