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Servers are not visible in network after removing DC with Windows 2003 RRS feed

  • Question

  • Hi, situation: my domain has currently three DC servers, one is W2003 R2, second W2008 R2, third, currently set as PDC is W2012. Domain level is 2003. I want to remove the oldiest server W2003 as DC and to up domain level to 2008 R2. At first, for sure, I switched off the W2003 server, to test if the rest DC are able to provide all services.
    First problem occured: No servers are visible in network, of course they works, clients can connect, servers are discoverable via "search Active Directory". I found guideline how to switch on three services on every server: Function Discovery Resource Publication, SSDP Discovery, UPnP Device Host (DNS client service is usually started) and it also works. When I did it on one server, its showed up immediatelly in network. My question is, why I have to do it? Why these services were not needed when W2003 run and now I have to use them? WINS server was not used many years.
    Thursday, August 27, 2020 10:19 AM

Answers

  • It's not about services, it's about the services being offered but not available. Again, switching off is not a test for ANYTHING AD-related except for 'what happens if this server goes down unexpectedly'. And, as you can see, a lot of things happen.

    Evgenij Smirnov

    http://evgenij.smirnov.de

    • Marked as answer by Artas Wednesday, September 2, 2020 10:58 AM
    Thursday, August 27, 2020 10:57 AM

All replies

  • Hi,

    switching off a DC is *not* a test of what will happen after you demote it. The old DC is still listed as DNS, LDAP, SYSVOL etc. and probably has FSMO roles assigned as well.


    Evgenij Smirnov

    http://evgenij.smirnov.de

    Thursday, August 27, 2020 10:27 AM
  • HI,

    I know that I have to use DCPROMO to unmount this DC. This switching off is test for "what else?" except roles which you mentioned. I checked FSMO, currently all five roles are set to DC with W2012.

    It is not big problem, only surprise for me, what service was able to do it on old server without services which I have to start now.


    • Edited by Artas Thursday, August 27, 2020 10:48 AM
    Thursday, August 27, 2020 10:47 AM
  • It's not about services, it's about the services being offered but not available. Again, switching off is not a test for ANYTHING AD-related except for 'what happens if this server goes down unexpectedly'. And, as you can see, a lot of things happen.

    Evgenij Smirnov

    http://evgenij.smirnov.de

    • Marked as answer by Artas Wednesday, September 2, 2020 10:58 AM
    Thursday, August 27, 2020 10:57 AM
  • OK, I understand and I agree with you regarding of switching off, but in this case, when I will remove old DC by the right way, do you suppose that it will solve issue with visibility automatically?
    Thursday, August 27, 2020 11:10 AM
  • check the dhcp server and figure out what dns servers it offers to client computers. it seems that server which you are trying to decommission used as primary dns on client computers.You have to migrate all roles (i.e. DNS,DHCP etc) from this server to other DCs before decommission it .


    • Edited by Denqu Thursday, August 27, 2020 12:31 PM
    Thursday, August 27, 2020 12:26 PM
  • check the dhcp server and figure out what dns servers it offers to client computers. it seems that server which you are trying to decommission used as primary dns on client computers.
    A valid point insofar that servers not doing DNS resolution should not be offered as DNS servers to clients. However, Windows 8 and above have abandoned th concept of a 'primary' and 'secondary' DNS server so it should work as long as one of the configured DNS servers is listening.

    Evgenij Smirnov

    http://evgenij.smirnov.de

    Thursday, August 27, 2020 12:33 PM
  • If replication, firewalls, DNS etc. are working OK, FSMO roles are not placed on the old server, WINS / NetBIOS is not being used by the clients *and* you only assign the new servers as DNS to clients, yes, it should be OK to demote one DC out of three...

    Evgenij Smirnov

    http://evgenij.smirnov.de

    Thursday, August 27, 2020 12:34 PM
  •  I must say, yes you are right, I removed old DC server W2003 with DCPROMO tool, then I manually removed its records from NTDS Settings > Connections on the remaining DCs and then after 1 hour I noticed that all servers are again visible in network places without my any additional intervention.
    Wednesday, September 2, 2020 11:12 AM