Virtuozzo / OpenVZ cPanel VPS hostname keeps changing
It's vital your server has an FQDM setup as its hostname. An FQDM (Fully Qualified Domain Name) will consist of two words and two full stops. Something like server.first2host.co.uk would be an FQDM whereas just server would be an invalid choice.
cPanel will use your hostname to send mail unless you have set up your server to send email via each accounts dedicated IP address. Not only mail, cPanel will also deploy SSL certificates to your server so you do not see any security warnings when logging in.
If you run a Virtuozzo cPanel VPS Server, formally OpenVZ then some settings on the hostnode can mean when you reboot your server your hostname will revert back to a single word. This will cause errors you're your cPanel server and this needs to be addressed urgently.
If your cPanel servers hostname keeps changing then first check the configuration file for the server.
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