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Thread: How to resolve error of "Root hints list has invalid root hint ser

  1. #1
    Join Date
    Nov 2005
    Posts
    52

    How to resolve error of "Root hints list has invalid root hint ser

    Hey guys, I’m facing some problem with my server. Since past few days I keep getting an error message whenever I run the dcdiag /test:dns. The test results are as follows:

    ********************
    Results of dcdiag /test:dns:
    ********************
    C:\>dcdiag /test:dns

    Domain Controller Diagnosis
    :
    :
    <<snip -- boring stuff removed>>
    :
    :
    Running enterprise tests on : acme.lan
    Starting test: DNS
    Test results for domain controllers:

    DC: dc01.acme.lan
    Domain: acme.lan


    TEST: Forwarders/Root hints (Forw)
    Error: Root hints list has invalid root hint server:
    a.root-servers.net. (198.41.0.4)


    <<snip -- this message is repeated several times, once for each root DNS
    server>>
    :
    :
    :
    TEST: Dynamic update (Dyn)
    Warning: Dynamic update is enabled on the zone but not secure acme.lan.

    Summary of test results for DNS servers used by the above domain controllers:

    DNS server: 202.12.27.33 (m.root-servers.net.)
    1 test failure on this DNS server
    This is not a valid DNS server. PTR record query for the 1.0.0.127.in-addr.arpa. failed on the DNS server 202.12.27.33
    Can anyone please help me with this? As far as I know the root hint server info is good but still don’t understand what is creating the problem.

  2. #2
    Join Date
    Sep 2004
    Posts
    73

    Re: How to resolve error of "Root hints list has invalid root hint ser

    Well that is not enough to get to the cause of the problem. Can you just post the complete ipconfig /all as well? Apart from this, also try running:
    dcdiag /v /fix > c:\dcdiag.txt
    netdiag /v /fix > c:\netdiag.txt
    and attach the two files with your next post please.

    I would like to know few more things such as what is your DCDIAG version and have you installed any service pack in the OS?

  3. #3
    Join Date
    Sep 2004
    Posts
    165

    Re: How to resolve error of "Root hints list has invalid root hint

    This is an internal DNS system. I don't really want it to resolve external names (use Forwarders for that), just overlooked a step of removingthe root hints list.

  4. #4
    Join Date
    Sep 2005
    Posts
    229

    Re: How to resolve error of "Root hints list has invalid root hint

    As for using an internal to resolve external, no need to remove the Roots. Just setup a couple of forwarders. More than likely the forwarders will resolve and it will never get to the Roots.

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