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My iptables show error on new system

You just need to SSH or access via noVNC Console and type 2 commands below:

mkdir /lib/modules/2.6.32-39-pve
depmod -a

If you're moved to new system with web control panel, your knockd may not be working so via...

NOTE: Console access may require you to use Chrome browser in Private Window. And if issues, try...

This newer system has different network location so as suggested when you first SSH to your new...

This usually happens on older system like "PBX in a Flash SILVER 1.7 (dahdi, asterisk 1.4)" so...

IMPORTANT: - Console access may require you to use browser that support TLS 1.0/1.1, like Chrome...