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How do I set reverse DNS (RDNS/PTR)?

Please simply open a ticket. Make sure your hostname actually resolves the IP address before requesting a reverse DNS record.
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How can I enable PPP?

PPP is enabled on our plans by default.

Kubernetes support on VPSDime Services

Full-stack k8s Kubernetes is not supported on our Linux VPS plans, as with the OpenVZ 7...

ufw is not starting and returning nf_conntrack_ftp module not found

You may receive the following error message while trying to enable ufw (ufw enable):ERROR:...

My VPS is using too much memory. What's wrong?

It probably isn't. You may be reading it incorrectly. Please refer to http://www.linuxatemyram.com/

How can I change my SSH port?

You can change your SSH port by simply logging in to your VPS and then opening up the SSH daemon...