Hi Erik,
Which NVR do you have? One with IVS for example? If so, the easiest way is to add an IVS rule, and link that IVS rule to your DMSS app. If you see those events coming through, then you (at least) know there is nothing wrong with your network. If these NVR push notifications are not coming through either, you might have them blocked in your internet router/firewall. It is a wise thing to "block" internet access from your NVR, however if you want push notifications (or email), you do need some outbound access.
Regarding firewall: I got a VTO2000A, and to my knowledge, that firmware is not compatible at all with your VTO2111. Now, did you try to fully factory reset the VTO (there is a burglar/thief button to the back I guess - it is with the VTO2000 - which you need to push 5-10 times until you hear a "bibiep" between the alarm chirpings. Then you have an empty empty VTO with every setting defaulted.
My suggestion: VTO is very stubborn to debug, start with the NVR, and see if that works. Then we work from there.
Succes!
CC