DNS Warning

This topic contains 12 replies, has 5 voices, and was last updated by  matro8 5 years, 1 month ago.

Viewing 13 posts - 1 through 13 (of 13 total)
  • Author
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  • cfell
    Member
    #162390

    Hi everyone. Glad to have found this forum. I seem to be having an issue with my dns server, but i don’t know where to start troubleshooting. Just a bit of background, our sbs2011 box is acting as the dhcp, dc, dns and ad. We are using root hints and disabled dns forwarders. I am getting what looks to be like a triangular caution sign.

    Any troubleshooting tips will be appreciated.

    thanks,
    Chris


    LSainsbury
    Member
    #308865

    Re: DNS Warning

    Why have you disabled DNS forwarders? You normally have your ISPs DNS servers in there.


    matro8
    Member
    #389155

    Re: DNS Warning

    Hi,

    i have renabled them. Also on the interfaces tab i have enabled listen on all ips. This seems to resolve the simple query issue, but the recursive query is still not working.

    thanks


    cruachan
    Member
    #330623

    Re: DNS Warning

    My usual starter for 10, run the SBS BPA and fix any issues. Also try running the Fix My Network Wizard.

    No reason at all why you need to have forwarders, Windows will work fine using root hints only so long as you have the MaxCacheTTL reg key set (which the SBS BPA will flag up if it is not).

    Where are you seeing the caution sign? If possible can you post a screenshot?


    matro8
    Member
    #389156

    Re: DNS Warning

    cruachan;277332 wrote:
    My usual starter for 10, run the SBS BPA and fix any issues. Also try running the Fix My Network Wizard.

    No reason at all why you need to have forwarders, Windows will work fine using root hints only so long as you have the MaxCacheTTL reg key set (which the SBS BPA will flag up if it is not).

    Where are you seeing the caution sign? If possible can you post a screenshot?

    Here is a screenshot


    matro8
    Member
    #389157

    Re: DNS Warning

    sorry about the lack of image in my previous post

    they say that I need to post five times before I can link to an external image

    Thanks for the help.
    Chris


    matro8
    Member
    #389158

    Re: DNS Warning

    fifth post


    matro8
    Member
    #389159

    Re: DNS Warning

    and now I should be allowed to post the img.

    here is a link to the img http://imgur.com/6wfW07V
    Thanks for the help.
    Chris


    teiger
    Member
    #231136

    Re: DNS Warning

    Does your Gateway/Firewall allow access to the Internet correctly? Do the stations resolve DNS queries to the Internet correctly? Try “nslookup” from a command prompt to see if names resolve correctly.
    As has already been mentioned (I think) try runing the BPA.


    matro8
    Member
    #389160

    Re: DNS Warning

    what about my enabling listen on all in the interface tab of the dns? this seemed to resolve the simple query, but not the recursive query test. Is it considered good practice to listen on all ips?
    I used nslookup on google and got

    Non-authoritative answer:
    Name: google.com
    Addresses: 2607:f8b0:4009:804::1008
    173.194.46.71
    173.194.46.78
    173.194.46.66
    173.194.46.73
    173.194.46.65
    173.194.46.68
    173.194.46.69
    173.194.46.64
    173.194.46.67
    173.194.46.72
    173.194.46.70
    Also, BPA did mention the lack of a MaxCacheTTL reg key set , which i will deal with.
    thanks


    matro8
    Member
    #389161

    Re: DNS Warning

    i misunderstood what was meant by the nslookup info. I just used the tool from my desktop when attached to the domain and got the following after typing in just: nslookup and the corporate url

    dns request timed out
    timeout was 2 seconds

    dns request timed out
    timeout was 2 seconds

    request to corporateurl timed-out


    matro8
    Member
    #389162

    Re: DNS Warning

    okay, set the MaxCacheTTL and that seemed to remedy the warning sign.

    thanks everyone,
    Chris


    teiger
    Member
    #231140

    Re: DNS Warning

    Do all computers (server(s) and workstations) point to the SBS for DNS?
    If not, fix it!

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