troubleshooting Question

Event error 4015 on RODC on perimeter network

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RhoSysAdminFlag for United States of America asked on
Windows Server 2012NetworkingActive DirectoryDNS
10 Comments1 Solution23 ViewsLast Modified:
We have a pair of W2K12 RODC's on a perimeter network. They've been around for a while now.  We recently discovered both are seeing the same DNS error on both of them. This error repeats every 5 minutes.

Log Name:      DNS Server
Source:        Microsoft-Windows-DNS-Server-Service
Date:          6/7/2021 9:36:13 PM
Event ID:      4015
Task Category: None
Level:         Error
Keywords:      (131072)
User:          SYSTEM
Computer:      RODC2
The DNS server has encountered a critical error from the Active Directory. Check that the Active Directory is functioning properly. The extended error debug information (which may be empty) is "". The event data contains the error.
Event Xml:

I'm wondering if these errors are due to the network settings on each RODC, both of which point to as its preferred DNS server, and the closest writable DC as its alternate DNS server.  These settings are based on recommendations in Microsoft's article - Modify the DNS client settings of an RODC.

I ran a "dcdiag /test:dns" on the RODC and saw this :

DNS server: 10.2.##.xx (
1 test failure on this DNS server
PTR record query for the failed on the DNS server 10.2.##.xx              

DNS server: 10.2.##.yy (
1 test failure on this DNS server
PTR record query for the failed on the DNS server 10.2.##.yy              

"dc1" and "dc2" are in the home "site" and are not directly accessible by the RODC (in the perimeter network).  There are two writable DC's in a neighboring site to the perimeter network that did not generate any errors.  

So is my problem in my network settings on the RODC's or is this a red herring I should just ignore.


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