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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 having issues with your VPN/OpenSwan not working, try ssh as root to the server and do...

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

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

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

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