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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...

On FreePBX system, when you force rebooted a server, it may go into Emergency mode with error...

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

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

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