@funtoosko, block all incoming ports to your cameras and NVR. For the DMSS notifications to appear, I have outgoing ports 8888 and 2195 open along with outgoing port 587 for email. So if you want these notifications and email, open only those ports outgoing. They are the only ones that pass traffic out according to my syslog server when notifications and email are generated by the NVR and cameras. To access the management of the NVR, or to view the live stream from your home, set up a VPN in your router or use a raspberry Pi (
www.pivpn.io) or use Zero Tier on an always-on computer to access the NVR from outside your home. The notification will come to your phone - if you are outside your home, you then turn on the VPN on your phone and you can then access DMSS to view. Alternatively you can view the snapshot photo that may have been sent with the email but you don't need VPN for that.
I have my NVR and cameras setup as above and have had no intrusions. Double check that P2P is disabled on your cameras and NVR. Change your password on your NVR and cameras.
I am also confused by what you have written regarding whether you have ports opened or not. It seems you have ports opened??
I would start by blocking ALL ports to NVR and cameras and changing the NVR and camera password and see what happens over the 24 hours. Double check that P2P is OFF and that it remains off after your reboot the cameras and NVR. If you want, you can also check if there is a firmware update for your NVR.