zone transfer tiemout

[Tun _]

Hi,

I am having a strange problem with my name server.  This name server is 
primary and slave for a number of zones.  Out of the slave zones, a few of 
them are getting below error messages.  Those slaves have the same primary 
DNS server. Other than below error my name server is working properly for 
its primary and other slave zones.

zone transfer timeout for "domainname.com"; pid 12345 killed
named-xfer "domainname.com" exited with signal 15.

The strange part is that the slave zones that are getting error are still 
resolving on my name server. So it tells me that it is getting cache info 
from primary but the backup db files are not getting updated because above 
error.

I have two questions:
1. Since my named appear to be functioning, what could have cause this 
problem.  (maybe some traffic are being bloack on the network?)

2. How can I turn-on a higher level of logging for named-xfer process?  I am 
hoping that it might give me more info to trouble shoot.

TIA,
Tun
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