Bind 9.6.1: skipping zone transfer, but why ?

[Chris Buxton]

On Jun 30, 2009, at 6:15 AM, bind9 wrote:
> 1) "skipping zone transfer as master 213.173.250.146#53 (source  
> 0.0.0.0#0) is unreachable
> (cached)" seem to indicate that the slave has cached a knowledge  
> about the master being
> unreachable. It isn't. I can nslookup on the master from the slave  
> just fine. What is wrong?

The slave is caching, for some length of time set in the source code  
(an hour? something like that), that the master is unreachable for  
zone transfers.

> 2) what causes "transfer of '3yhta.dk/IN' from 213.173.250.146#53:  
> failed to connect:
> connection refused" ? There is no evidence of "connection refused"  
> in the masters log, so where
> could this come from?


The master is unreachable over TCP. The port has gone deaf. We see  
this on some operating systems and not others. (We don't work much  
with BIND on Windows, so we hadn't seen the issue on that OS.)  
Basically, when the port is not used for a while, it looks like the OS  
shuts down the listener without telling the service.

Chris Buxton
Professional Services
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