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I found some references to issues with App Armour so I turned it off, but I still have the issue.Here is part of the syslog output: Jul 19 morgan dhcpd: Added new forward map from tech-Coordinator.gilman.k12us.Well over 70 percent of all support calls that come to Microsoft support services that start out as Active Directory or Exchange calls end up being DNS calls.Yet, as you’ll see in this article, most of these issues don’t require extensive diagnostic work or sophisticated tools to isolate and resolve.Reverse DNS records are essential for those running a mail server since many recipient servers reject, or mark as spam, all email that originates from an “unauthenticated” server.

This article shows how to add a reverse DNS record (also known as an RDNS record and a PTR record) to map your server’s IP address to a domain name (for example, 1.2.3.4. Perform the following steps the create a reverse DNS record in the Cloud Control Panel: ©2017 Rackspace US, Inc.

The process of acquiring reverse resolution is accomplished using PTR records that are rooted in the domain.

ARIN requires organizations to maintain their domain records for associated networks so that reverse resolution can be managed effectively.

to 172.20.4.205 Jul 19 morgan dhcpd: unable to add reverse map from 205.4.20.172.

to tech-Coordinator.gilman.k12us.: not authorized Jul 19 morgan dhcpd: DHCPREQUEST for 172.20.4.205 from :8c::c8 via eth0 Jul 19 morgan dhcpd: DHCPACK on 172.20.4.205 to :8c::c8 (tech-Coordinator) via eth0. Are you handing out addresses in a /16 block for this zone?

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