Likely yes but I’m not enough of a network pro to tell you how to change it
I’m guessing either you don’t have P2P enabled on the NVR or Dahua’s P2P server is offline. You may also get that if you’re connected to your home LAN/wifi when trying to reach the NVR remotely via P2P
I have separate profiles for inside/outside my network (local wifi vs P2P)