port 280???

[John]

Hi,

Our DNS's are HP Unix BIND 8.2.5
We have a master and 2 slave DNS's.
When I change the serial from the master DNS, the update is fetched from
the master to the slave DNS's (no problem), but when both DNS's send a
request to the master (because the SOA). I found the next errors
continuously in the /var/adm/syslog/syslog.log

Err/To getting serial "db.x.x.x
Err/To getting serial "db.127.0.0
etc..etc

I get this error since I activate port 53. When I disable it, the errors
are gone from the syslog.log

query-source address x.x.x.x port 53;

I have check all DNS's they use port 53. We have firewall between the
master and slave DNS.
Domain tcp and udp port are allowed include port 53, both direction.

So why I still get error?? How solve that??

I heard from somebody that I have to open port "240" for zone transfer,
is that true??

Any anwser is welcome.

Best regards,

John