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Hosts register their DNS entries when entering the domain, and refresh these entries periodically. DNS servers might allow dynamic updates or not or limit them them to only secure updates. If the entries aren't refreshed in a predetermined time, they get scavenged by a clean up rule (according to the timings defined in the DNS server.)<br />
<br />
check that dynamic updates are allowed.<br />
review your DNS server's scavenging periods<br />
check that configuration on the TCPIP for those servers have the options configured to register in the DNS server (TCPIP advanced configuration, DNS)
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Hosts register their DNS entries when entering the domain, and refresh these entries periodically. DNS servers might allow dynamic updates or not or limit them them to only secure updates. If the entries aren't refreshed in a predetermined time, they get scavenged by a clean up rule (according to the timings defined in the DNS server.)

check that dynamic updates are allowed.
review your DNS server's scavenging periods
check that configuration on the TCPIP for those servers have the options configured to register in the DNS server (TCPIP advanced configuration, DNS)

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I have a DNS server that has dropped IP address of four servers with static IPs. Does anyone have an idea?
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I have a DNS server that has dropped IP address of four servers with static IPs. Does anyone have an idea?

DNS losing IP address in DB

Interactions between email servers and clients are governed by email protocols. The three most common email protocols are POP, IMAP and MAPI. Most email software operates under one of these (and many products support more than one).  The correct protocol must be selected, and correctly configured, if you want your email account to work.

Email Protocols

The Dynamic Host Configuration Protocol (DHCP) is an auto configuration protocol used on IP networks and an extension of the Bootstrap Protocol. DHCP allows for computers to be configured automatically to communicate with each other over an IP network without the need for manual setup by a network administrator. The implementation of DHCP relies on a DHCP server to hand out network configuration information to DHCP-capable clients that request an IP address (and other information required or useful in communicating with other devices on an IP network). In addition to an IP address, common configuration information served over DHCP includes a default gateway, subnet mask and DNS sever(s).

DHCP

The Domain Name System (DNS) is a hierarchical, globally distributed system responsible for associating the name of a computer, service or other resource into an IP address for connecting to the Internet or a private network. Most prominently, it translates domain names to the numerical IP addresses needed for the purpose of computer services and devices worldwide.