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DNS Config Issues - Host server not found: 3(NXDOMAIN)

Discussion in 'Bind/DNS/Nameserver' started by dkz, Oct 23, 2007.

  1. dkz

    dkz Well-Known Member

    Sep 10, 2004
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    I am setting us a new server and I requested a reverse dns record from the data center and I was told they could not do it unitl there was a "valid forward lookup hostname(their words)". The error they refrenced is "Host not found: 3(NXDOMAIN)".

    If I type in #host server, I get Host server not found: 3(NXDOMAIN). I've read previous posts on this but none have yet helped. I also did a dns report and it came back good.

    Thanks for any help!
  2. mtindor

    mtindor Well-Known Member

    Sep 14, 2004
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    inside a catfish
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    Your data center is telling you that they cannot add the reverse DNS record that you chose until forward DNS for that address is also active.

    For instance, if you contacted your provider and said "Please add reverse DNS for 111.222.333.444 so that it resolves to", they are then doing an nslookup (or host or dig command) on to see if it returns 111.222.333.444. They have done a lookup on and it did not return back any information. And they don't know if the owner of has authorized you to have a rDNS record in place called and they just want to use a forward lookup as verification that you are authorized to use in rDNS.

    If you want to PM me the hostname in question and the IP address you are trying to get rDNS for I'll attempt to tell you what is going on. But it seems like whatever nameservers are authoritative for that hostname/domain do not have a valid record for that particular hostname that you are seeking rDNS for.

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