PTR record is a piece of information based on which the DNS realises IP address ---> name translation. PTR records are not recorded in the same zone as the others (e.g. A or CNAME records) but in their own zone, the name of which starts with a seemingly strange word identifier (including something like addr arpa etc.) and ends with the reverse order of IP network octets. The problem with mail is the purpose PTR records are sometimes used for: if the client requires a service on the Internet, the inquiry is sent and the target server tries to perform a reverse translation based on the sender's IP -- if the PTR record and its zone exist and are "visible", the action results in translation to your domain name, thus confirming your existence. If the translation fails, some servers will deny their services.
A KVM over IP is very useful device, that can save you a plenty of hours and kilometers to remote server. This device can provide keyboard (K), video output (V) and mouse (M) via IP protocol, directly into your browser. You can easily install your server and/or fix kernel or firewall from your home, when something is wrong.
This is another guide which will help you manage your virtual servers. Based on the feedback received from our customers, the previous article first step with VPS was very popular and helpful. Because the installation and administration of virtual servers running on the Windows operating system is a little bit different, we have decided to create a detailed manual to help you handle virtual servers running on MS Windows Server.