named in sandbox

[Muhammad Reza]

dear All,

I running named in sandbox as a secondary name server with FreeBSD-5.1.p17,
Named log always complain:
named-xfer exited with signal 6 and slave zone expired for every zone 
transfer.
but, when it's running on default mode (no chroot sandbox) or as a 
primary server (with chroot sandbox). named work fine.
please help me , how to make secondary zone transfer running in sandbox

regards
reza