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It's actually the exact opposite. The router is set to forward port 20256 from their public IP address (WAN) to their to their private IP address (LAN). This is actually fairly common, and while it's not secure, it's generally okay because there is little incentive (profit motive) to hack in these situations. Tensions in the ME provided the incentive absent a profit motive.
It's a good lesson learned here - avoid using default settings.
Anyone affected by this hack had port 20256 forwarded to their public IP.
It's literally because the programming port is forwarded to the internet, doesn't even really qualify as a hack. If you get hit by this you should fire your networking guy.
I've had a couple of customers hit by this. I've been in communication with Unitronics and the problem has understandably been promoted to top priority.
Their position right now is a VPN is the way to go.
I know this is an old topic, but I wanted to see if there's been any movement on having a 2nd network port available for things like MODBUS/TCP?
Right now it's quite a bit of work to get these PLCs onto two (2) networks without having the OT Network group freak out over network security issues.