This forum is only for reproducible bugs with csf and lfd (i.e. not iptables problems, lack of understanding how to use a feature, etc). Posts must be accompanied with full technical details of the problem and how it can be recreated. Any posts not adhering to this, or not considered bugs, will be moved to the General Discussion (csf) forum.
I've installed csf to my VPS, then all hosted sites can't not be displayed and are getting Gateway Timeout.
And always getting "SSH Error, The current connection has timeout" when trying to login to SSH.
I'd be so appreciative if I get any recommendations.
That suggests that you've either configured the ETH_DEVICE incorrectly (you should normally leave it blank) or that iptables is properly supported on your VPS. I'd guess at the first problem.