connection reset for zone notify

[bizbox]

hi,
   i am currently running a slave DNS server with BIND while one of my
customer is sending their master zone to me with zone notify using djbdns ,i
got the following error:

Oct 06 10:03:51.684 xfer-in: error: transfer of domainname.com/IN' from
192.168.0.1#53: failed while receiving responses: connection reset
Oct 06 10:03:51.684 xfer-in: info: transfer of 'domainname.com/IN' from
192.168.0.2#53: end of transfer

where 192.168.0.1 is the fictional pridns IP of my client running djbdns and
192.168.0.2 is the secondary IP of  my DNS server running BIND.

rgds
bizbox