This Knowledge base article provides information about the configuration of Automatic DNS registration on a server protected by Neverfail Continuity Engine.
Neverfail Continuity Engine recommends that the NICs used for Principal (Public) and/or Channel NIC should have the "Register this connection's addresses in DNS" check box cleared/disabled prior to installing or upgrading Neverfail Continuity Engine to prevent issues with DNS name resolution. If "Register this connection's addresses in DNS" is detected as enabled, an acknowledgeable warning message is issued to inform the user that this feature will be automatically disabled during install/upgrade (if user acknowledges), and to recommend that they verify and make necessary adjustments to the DNS configuration (detailed in the following procedure).
Neverfail Continuity Engine checks periodically the status of the NICs used for Public and Channel connections. If it detects "Register this connection's addresses in DNS" feature as being enabled, it will automatically disable it and issue a warning to inform the user about this condition.
Channel and Management addresses may get automatically registered in DNS, resulting in clients being unable to connect to the protected application because their DNS queries are resolving to either a Channel or Management address; which may not be accessible from the public network, instead of the Principal (Public) address.
The user should review their DNS configuration and identify DNS name servers with zones that are configured for dynamic updates looking specifically for unwanted entries in both the forward and reverse zones that refer to the Neverfail protected cluster name which resolve to either channel or management IP addresses (or the PTR equivalents) and remove them.
Note: In a DR (WAN) environment configured with different Public IP addresses for each site, automatic DNS updating is provided by Neverfail Engine through a dedicated task.
Neverfail Continuity Engine 8.5 and later