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Windows Server 2008 R2 Thread, Replacing old DC problems. in Technical; Hi guys, I'm having a very odd problem trying to replace a Old DC with a new one. On the ...
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    Question Replacing old DC problems.

    Hi guys,

    I'm having a very odd problem trying to replace a Old DC with a new one.

    On the old server, when entering the new server name at the Change Directory Server screen in ADUC (when trying to transfer the FSMO roles from the old server to the new one), I get the following error:
    aduc error.PNG
    But if you attempt it from the other way round, ADUC on the new server can change to the old server and back with no problems.

    If I then transfer the roles on the new server, the old server reports ERROR for the operation master for all the roles transferred.

    Is there something major I've missed out?

    Both servers are running 2008R2 Datacenter if this helps?

    Thanks in advance!

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    First step - try DCDIAG from a command prompt and see if there are any issues?

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    Thanks for your reply!

    I've ran DCDIAG on both servers and attached the results to this post. They're both showing errors, but the errors appear to be caused by the old server more than the new one.
    I wouldn't know where to start with most of these errors, so any help is much appreciated!

    DCDiag_NewDC.txt
    DCDiag_OldDC.txt

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    Michael's Avatar
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    My immediate thoughts are a DNS issue, as Windows Server will no doubt try resolve the FQDN of the new DC. Is DNS able to replicate across both servers? I'd check each Forward and Reverse Lookup Zones on both servers.

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    I know at one point the DNS wasn't replicating, but since then I have removed the new server and added it again. I'll take a look now and see if they're both the same!

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    Just had a look at both servers dns records, and they're not showing the same entries. The new server has a computer listed that the old one doesn't. So i'm guessing that's problem number 1?

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    To speed things up (on the new server), if you type ipconfig /registerdns it'll register within 15 minutes (or something like that).

    I'd also make sure the old DC and new DC IP config is correct i.e.

    Old DC: 192.168.1.1 (first)
    New DC: 192.168.1.2 (second)

    New DC: 192.168.1.2 (first)
    Old DC: 192.168.1.1 (second)

    DNS will be the root of this problem. Once DNS is fixed, you'll be able to transfer roles. It is vital this is working, otherwise your end users will complain about logging on speeds etc... worse case scenario.

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    I'll go check them now, I've got the feeling they might be the other way round so i'll sort them.
    One other thing to add is the old server is running unresponsively slow, so I'm having to do most stuff through CMD as the GUI is crashing out all the time. Could this be DNS related as well?

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    Quote Originally Posted by forde52 View Post
    I'll go check them now, I've got the feeling they might be the other way round so i'll sort them.
    One other thing to add is the old server is running unresponsively slow, so I'm having to do most stuff through CMD as the GUI is crashing out all the time. Could this be DNS related as well?
    A slowness of a server should simply mean it'd take longer to process requests, such as transferring roles. The immediate solution is to give the server a reboot (if it's been a while), or alternatively stop some unrequired services to free up resources.

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    Oh right ok, It's had plenty of restarts the past few days so not sure what's going on there.
    I've just changed the DNS settings on the old server through CMD, and i've just been met with the following error
    Screen Shot 2013-11-14 at 09.49.20.png
    Should this worry me or should I just ignore it?
    (.14 is the old server and .16 is the new server)
    Last edited by forde52; 14th November 2013 at 11:00 AM.

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    Have you disabled the built in Windows Firewall on both servers? This could be creating your DNS issue, as servers are unable to replicate.

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    I have yes, I thought that might have been an issue but it appears it hasn't made a difference.

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    just a thought is dns set to be stored in active directory I occasionally wonder why it wont replicate only to find its set to be stored locally not in ad?

    I presume they each have themselves and the other server listed as dns server in their nics properties and can ping each other by name and ip?

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    The other possibility is a switch issue - if you have VLANs setup or just a fault with your switch in general?

    I agree with the above - DNS should be integrated with AD these days. There are few reasons not to.

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    DNS on both servers is saying it is Active Directory-Integrated. Both servers have themselves and the other server in the Nic's DNS settings. They can both ping each other by name and ip as well. So it's looking like it's not a network connectivity issue?



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