So forgive me because a lot of these conversations regarding Telnet, and code is quite simply over my head.
Here is what we do
We use default TCP port of 37777
We change the HTTP port to 88
We never use admin admin. We change this to a new password that we use on all NVR/DVR to keep it simple for our techs. We do NOT share this with clients. Never happened but if a client insists on admin password we will change to what they want so they have control.
What else can we do?
Will changing the ports help? Should we change them to something much higher?
Will upgrading everything to newest firmware help?
Our clients are not going to do VPN.They want the cheapest item. Bottom line. What is the next best option after VPN for remote access?