Partial Glossary of DNS Error Messages
0 | No Error |  | No Error
You should never see this. Instead you will get the results you requested. |
1 | FormErr | | Format Error
Check your query for a syntax error. |
2 | ServFail | | Server Failure
??? - I don't know the answer to this one. |
3 | NXDomain | | Non-Existent Domain
The server returns this domain as not a domain for which it has or can get records. If this is the authoritative server (the one referenced by the DNS record via whois), check the spelling of your DNS record for a misspelling. If this server is not authoritative, and it works on the authoritative one, then this server has old data or corrupted data. Wait the allotted refresh time and see if the issue corrects itself. |
4 | NotImp | | Not Implemented
The server could not process the request as it does not support that feature. |
5 | Refused | | Query Refused
You generally see this with a nslookup ls -d command where you are trying to do a zone transfer. Many DNS servers are set to not allow zone transfers anymore due to abuse. I have also seen other messages from ISP servers with "BAD ERROR VALUE" that seem to have zone transfers disabled, too. |
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... | | | There are more, but I do not generally see them. Below is URL to the specification:
http://www.iana.org/assignments/dns-parameters |
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In addition, for NSLookup queries, if the DNS server is unreachable: the server is down, the DNS service/server is down, or there is a network issue, then the message back from NSLookup is:
Timed-Out.
If you get "Non-existent" domain as NSLookup is starting, then the issue is that the default DNS server for your workstation does not have a reverse pointer (PTR) record. You need to create one.
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