Thank you all. I've confirmed that the problem is firewall related. I've replaced my current Untangle firewall with a simplest Linux NAT iptables firewall and everything works perfectly, without any complains.
Thank you very much for your kind help/suggestions.
Shi
_______________________________________________
bind-users mailing list
bind-users@lists.isc.org
https://lists.isc.org/mailman/listinfo/bind-users
