Manually switch authentication dc

Posted on 2012-09-10
Last Modified: 2012-09-17
Hi All,
Manually switch authentication dc
I have 2 DC's in a location and one DC is down and few systems and not all do not get authenticated from the new 2nd DC.

How can i manually ask it to authenticate from DC2?

Set l shows all Dc's available

Question by:bsharath
    LVL 6

    Assisted Solution

    Make sure the both DC are available to the Site in AD Sites and Services. Also make sure that the DNS server address points to both DC's.

    LVL 6

    Assisted Solution

    LVL 57

    Assisted Solution

    by:Mike Kline
    The Dc is cached for 15 minutes after 15 does it still show the downed Dc?
    LVL 18

    Expert Comment

    I would have removed the IP of 1st DC from DNS server preference on NIC card of client or had redirected via host file to use or domain to use IP of 2nd DC  if the endpoints are not more in count.

    Are you planning to switch on the down DC ?
    LVL 11

    Author Comment

    Until we fix the DC 1 issue need these clients to authenticate from DC 2

    So via Hosts file what can i do
    LVL 18

    Expert Comment

    Host file looks something like below
    # Additionally, comments (such as these) may be inserted on individual
    # lines or following the machine name denoted by a '#' symbol.
    # For example:
    #          # source server
    #              # x client host       localhost
    ::1             localhost   Domain

    assuming 10.2 is the IP of your new DC and your Domain name is I would have added one of above two entries separated by a tab whichever works for me
    LVL 18

    Accepted Solution


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