query cache denied

[pyh at mail.nsbeta.info]

I saw lots of this info in bind's log: 

Jan 20 05:25:43 ns2 named[6538]: client 69.10.140.146#33135: query (cache) 
's2.xxrz.game.yy.com.cdn20.com/A/IN' denied
Jan 20 05:26:47 ns2 named[6538]: client 200.31.4.71#41137: query (cache) 
's3.xxrz.game.yy.com.cdn20.com/A/IN' denied 

I'm using bind-9.6, it's the authoritative name server only.
How does the client make a query to request to bind's cache? 

Thanks.