Below is result. # dig SRV _kerberos._ tcp.din.uem.br ; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.23.rc1.el6_5.1 <<>> SRV _kerberos._ tcp.din.uem.br ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 55207 ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0 ;; QUESTION SECTION: ;_kerberos._. IN SRV ;; AUTHORITY SECTION: . 10668 IN SOA a.root-servers.net. nstld.verisign-grs.com. 2014101000 1800 900 604800 86400 ;; Query time: 1 msec ;; SERVER: 10.30.0.15#53(10.30.0.15) ;; WHEN: Fri Oct 10 09:15:56 2014 ;; MSG SIZE rcvd: 104 ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 9293 ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0 ;; QUESTION SECTION: ;tcp.din.uem.br. IN SRV ;; AUTHORITY SECTION: din.uem.br. 3468 IN SOA ns2.din.uem.br. analistas.din.uem.br. 2014032613 1800 900 60480 3600 ;; Query time: 0 msec ;; SERVER: 10.30.0.15#53(10.30.0.15) ;; WHEN: Fri Oct 10 09:15:56 2014 ;; MSG SIZE rcvd: 82 -- Ao encaminhar esta mensagem, por favor: 1. Apague o meu e-mail e o meu nome. 2. Apague também os endereços dos amigos antes de reenviar 3. Use Cco ou Bcc para enviar mensagens! Dificulte a disseminação de vírus e spam.