Erro em dns ns1 e ns2

tenho os 2 servidores configurados, resolvendo nomes. so que quero fazer funciona www ftp.
oque esta ocorrendo no ns2 esta com este erro Jun 23 02:47:20 ns2 named[32617]: zone aaa.11.189.in-addr.arpa/IN: refresh: unexpected rcode (SERVFAIL) from master 189.11.aaa.bbb#53
e nos registro br nao esta funcionando
named.conf do ns1 =
//DOMINIO PRINCIPAL
zone "mosaicotelecom.com.br" IN {
type master;
file "mosaicotelecom.hosts";
allow-update { 189.11.aaa.xxx; };
};
//REVERSO
zone "136.11.189.in-addr.arpa" IN {
type master;
file "aaa.11.189.in-addr.arpa.zone";
allow-update { 189.11.aaa.xxx; };
};

named ns2=
//DOMINIO SECUNDARIO
zone "mosaicotelecom.com.br" IN {
type slave;
file "mosaicotelecom.hosts";
masters { 189.11.aaa.bbb; };
};
//REVERSO
zone "aaa.11.189.in-addr.arpa" IN {
type slave;
file "136.11.189.in-addr.arpa.zone";
masters { 189.11.aaa.bbb; };
};


alguem pode me dar ula luz oque pode ser isso que esta ocorrendo.

tenta iniciar o bind com -f e -g pra ver se tu ve o bug na tela...

named -f -g

esta msg que apareceu
Jun 23 09:03:12.265 starting BIND 9.2.3 -f -g
Jun 23 09:03:12.265 using 1 CPU
Jun 23 09:03:12.269 loading configuration from '/etc/named.conf'
Jun 23 09:03:12.270 /etc/named.conf:12: option 'memstatistics-file' is not implemented
Jun 23 09:03:12.290 no IPv6 interfaces found
Jun 23 09:03:12.290 listening on IPv4 interface lo, 127.0.0.1#53
Jun 23 09:03:12.291 binding TCP socket: address in use
Jun 23 09:03:12.291 listening on IPv4 interface eth0, 189.11.136.211#53
Jun 23 09:03:12.291 binding TCP socket: address in use
Jun 23 09:03:12.292 could not configure root hints from 'named.ca': file not found
Jun 23 09:03:12.292 loading configuration: file not found
Jun 23 09:03:12.292 exiting (due to fatal error)