[Forum FAQ] Timeout occurs when using Nslookup.exe to resolve the multi-label domain names

symptom:

sometimes, may build root domain multiple labels, such "e.d.c.b.a.com". however, when use nslookup.exe resolve multi-label domain name, timeout occurs before returns result.

from figure 1, can see when using nslookup.exe resolve domain name e.d.c.b.a.com, dns request timed out.

figure 1．

cause:

when use nslookup.exe resolve multiple-label, unqualified (not terminated period) name, nslookup.exe systematically appends different dns suffixes name have entered, adds periods make them qualified domain name (fqdn), , resubmits dns server.

if resolution not successful, nslookup.exe devolves fqdn appending parent suffix of primary dns suffix name. if there no parent domain, timeout occurs.

you can see process of resolving e.d.c.b.a.com via nslookup.exe in figure 2:

figure 2．

resolution:

to avoid issue, can input fqdn terminated period or disable search list in nslookup.exe.

  1. input fqdn terminated period

you can enter fqdn terminated period when using nslookup.exe resolve multi-label domain name. figure 3, can see there no timeout error when using e.d.c.b.a.com.  in nslookup.exe.

figure 3.

  2. disable search list in nslookup.exe

to disable search list in nslookup.exe, please use commands below in order:

• nslookup
• set nosearch
• domain name

from figure 4, can see if disabled search list, can resolve domain name e.d.c.b.a.com without timeout error.

figure 4.

more information:

nslookup

http://technet.microsoft.com/en-us/library/bb490721.aspx

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Windows Server  >  Platform Networking