It *IS* definitely a DNS request. Tracking it down to the requestor will be
some hard work.
This is RESOLVER telling you it was unable to contact the designated DNS with
the defined time period.
As other have stated, there are some knobs that can be turned to reduce the
frequency of this message.
This is not an indication of a z/OS problem. z/OS is reacting to the DNS not
responding in a timely manner.
HTH,
<snip>
Once in a while we receive this series of messages:
14128 13:58:52.67 STC17917 00000090 *EZZ9308E UNRESPONSIVE NAME SERVER DETECTED
AT IP ADDRESS x.x.x.x
14128 13:58:52.67 STC17917 00000090 EZZ9310I NAME SERVER x.x.x.x 409
409 00000090 TOTAL NUMBER OF QUERIES SENT 2
409 00000090 TOTAL NUMBER OF FAILURES 1
409 00000090 PERCENTAGE 50%
14128 14:03:52.68 STC17917 00000090 EZZ9309I NAME SERVER IS NOW RESPONSIVE AT
IP ADDRESS x.x.x.x
14128 14:03:52.68 STC17917 00000090 EZZ9310I NAME SERVER x.x.x.x 257
257 00000090 TOTAL NUMBER OF QUERIES SENT 2
257 00000090 TOTAL NUMBER OF FAILURES 0
257 00000090 PERCENTAGE 0%
The messages are issued by the resolver address space.
Is there a way to find out what is causing these messages?
It looks like some kind of DNS query.
</snip>
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