Feb  5 01:39:33 server named[19768]: zone myzone.com/IN: serial number (12331465) received from master 127.0.0.2#53 < ours (200901281)

The above is taken from /var/log/messages

This can be annoying, it can happen for a variety of reasons.  What seems to be happening here is that the slave realizes the time on the slave is ahead of the master, so it therefore assumes it has the most up to date copy and won't actually transfer the zone.

The solution is easy.  Here's what you type on the slave:

rndc retransfer myzone.com

*Replace "myzone.com" with the actual name of the domain you want to transfer to the slave (of course the slave must already have the domain defined in /etc/named.conf.  Remember that "myzone.com" is the domain name, even if you have a zone file called "myzone.com.db" you wouldn't type that or it won't work.

The command above forces BIND to transfer the zone no matter what.