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I have a really strange scenario...We have a server within a DMZ, which uses an RODC (Read-Only Domain Controller) for user authentication. The users are in a trusted 3rd domain, something like this:

DMZserver -> RODC -> InternalDC -> TrustedDC -> User

This is all to allow us to RDP/login to the DMZserver. It works currently for an older Windows 2008R2 server, but when we attempt to use these new servers (setup basically identically (same network subnet, same firewall rules, validated communication with the RODC, etc) it WILL NOT authenticate or communicate with the InternalDC's through the RODC.

I've looked at the replication and joined/rejoined the DMZServer to the internal domain several different times and ways. However I continue to get a netlogin issue, it won't connect to the RODC for DNS, Time Settings, login authentication, etc...

Its maddening, and I'm at a loss, so I'm hoping someone can give me some guidance or pointers on how I can gather some more information on this.

I have reviewed the question at Windows Server 2012 R2 Standard located in our DMZ has problems with connection to RoDC

However the solution presented there with the sitename does not solve my issue and has been tested multiple times.

Any help would be appreciated!

  • In all the cases of the I've seen its because something wants a regular DC and something blocks the referral passed from the RODC. – Jim B Jan 22 '16 at 2:08
  • Also, for a test, add a brand new 2008 dc to your dmz, and see if the second 2k8 server will auth. – Jim B Jan 22 '16 at 2:10
  • A new piece of the puzzle was discovered late yesterday. I've validated that the DMZServer allows users from the InternalDC (internal domain) to login (provided they have rights when the DMZserver has the group or user added to local admin). So these users can login, but the DMZserver acts as though its not connected to the domain at all through the RODC. – Sean Falconer Jan 22 '16 at 16:29
  • I should point out this is a Windows 2012R2 DMZServer, with a Windows 2008 R2 RODC and domain environment. With the existing servers that are functional, they are all 2008 servers, that work fine with the RODC model. – Sean Falconer Jan 22 '16 at 16:35
  • Is is solely for RDP authentication to have an RODC? – Jim B Jan 22 '16 at 17:26
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So we seem to have discovered a workaround for the issue at hand. So we pre-populated and replicated the account details and passwords from the Internal Read/Write domain controller to our ReadOnlyDomainController (RODC) within the DMZ sites. Once we had replicated/cached the computer details over to the RODC, this allowed the computer account (windows 2012 R2) servers to communicate properly.

We are still investigating with Microsoft, but hopefully this will help others that maybe having similar odd behaviours with RODC systems in DMZ designs.

Please let me know if you have further questions around this issue, and I'll be happy to provide additional information.

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