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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 change my SSH port?

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

Unable to launch Docker swarm due to br_netfilter messages

When receiving the following message:"error creating external connectivity network: cannot...

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/

My disk quotas are not working. What to do?

For our Linux VPS line: Second level quotas are enabled by default.For Premium VPS line: You can...

How can I enable PPP?

PPP is enabled on our plans by default.