slave fail to ixfr from master

[/dev/rob0]

On Sun, Sep 14, 2014 at 04:40:52PM +0800, Liu Mingxing wrote:
> Our slave can not get ixfr data from master, the soa number in
> the slave is smaller than one of the master and no responding
> lines are not found in the notity log. However, in the slave
> server, connections about both of them are found with tcpdump.
> 
> to reboot the named can not fix the problem.
> 
> Do you meet with the problem? how to fix it?

Show us the things you have described; "host -C example.com" shows 
all the listed NS hosts and their SOA records.  Why are notifies 
(apparently) not being sent?  Maybe this slave is not an NS host?
(That's what also-notify in the master zone definition is for.)
Also check that the master lists this slave in its allow-transfer
setting, either in global options or in the zone definition.

Also include logs and configuration from both master and slave, if 
this wasn't enough to get it figured out.
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