isc domain lookup

Yossi Eskenazi yossi.eskenazi at
Wed May 14 20:50:52 UTC 2014


My question is not directly related to bind, but since it's related to isc
I decided to ask here.

Some name servers I perform a lookup does not respond to queries, if they
begin with "isc"

Example server :
Query for any domain, it responds. Sometimes it times out, but ask again ,
it eventually responds.
Query for "" "" "" or just "isc",  it times

Example server:
Query for any domain, it says "query refused"
Query for "" "" "" or just "isc",  it times

It's not just these two, there are other name servers behaving this way.

What can be the reason for this?

Thanks for your help

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