Error Unexpected Rcode Refused Bind
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"error (unexpected RCODE REFUSED)" mean? Posted by Eric on 14 July 2015, 1:29 am If you're seeing this in the /var/log/syslog on unexpected rcode refused resolving your BIND DNS server: Jul 14 00:56:13 kla-dns-01 named[8255]:
Error (formerr) Resolving
error (unexpected RCODE REFUSED) resolving '75.1.33.112.in-addr.arpa/PTR/IN': 211.136.17.105#53 ..it means that a client has asked your rcode refused dns server to look up a domain name that your server didn't know about, and when it forwarded the request to it's forwarders, the remote DNS
Category Lame-servers {null;};
server refused to respond. A packet trace on your DNS server shows exactly what's happening: root@dns1:/# tcpdump -n -s 1514 -v 'port 53' tcpdump: listening on eth0, link-type EN10MB (Ethernet), capture size 1514 bytes 00:56:09.686771 IP (tos 0x0, ttl 62, id 44942, offset 0, flags [DF], proto UDP (17), length lame server resolving 70) 10.5.11.101.42237 > 10.0.10.10.53: 17985+ PTR? 75.1.33.112.in-addr.arpa. (42) ^… One of your clients sends a request to your DNS server asking for the reverse-IP request (a "PTR" request) for the domain-name corresponding to IP address 112.33.1.75 (expressed in reverse as "75.1.33.112.in-addr.arpa.") 00:56:09.687284 IP (tos 0x0, ttl 64, id 28584, offset 0, flags [none], proto UDP (17), length 81) 10.0.10.10.6374 > 10.0.0.2.53: 26305+% [1au] PTR? 75.1.33.112.in-addr.arpa. (53) ^… The DNS server forwards the reverse-IP request to it's "upstream" forwarder DNS server, 10.0.0.2. 00:56:12.218438 IP (tos 0x0, ttl 64, id 39251, offset 0, flags [none], proto UDP (17), length 81) 10.0.10.10.27738 > 211.136.20.201.53: 63185% [1au] PTR? 75.1.33.112.in-addr.arpa. (53) ^… After 3 seconds without a reply, the server sends the request to it's next forwarder, 211.136.20.201. 00:56:13.018706 IP (tos 0x0, ttl 64, id 34335, offset 0, flags [none], proto UDP (17), length 81) 10.0.10.10.37801 > 211.136.17.105.53: 55483% [1au] PTR? 75.1.33.1
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Error (network Unreachable) Resolving
us Server Fault Questions Tags Users Badges Unanswered Ask Question _ Server Fault is a question and answer site for system bind disable ipv6 and network administrators. Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top unexpected http://www.ericshalov.com/2015/07/14/what-does-error-unexpected-rcode-refused-mean/ RCODE REFUSED - eating up log files up vote 1 down vote favorite 1 I have a website which I host myself, and I use bind9 as my DNS server (host my own nameservers etc.). I am having a problem with traffic bandwidth, and my syslog is full of the following type of issue: error (unexpected RCODE REFUSED) resolving 'target-express.com/AAAA/IN': 193.95.142.60#53 error (unexpected RCODE REFUSED) resolving 'target-express.com/A/IN': 2001:7c8:3:2::5#53 In today's syslog, http://serverfault.com/questions/672566/unexpected-rcode-refused-eating-up-log-files there are 144258 instances of this, all related to target-express.com. My questions are: is there anything I can do firewall-wise or bind config to stop this? Why would my bind setup be trying to resolve target-express.com (it's not my domain, nothing to do with me). I have checked my forwarders in named.conf, and none of them match the IPs showing in the logs (they are all basically different IPs, not just 193.95.142.60). My iptables reads: Chain INPUT (policy ACCEPT) target prot opt source destination ACCEPT all -- anywhere anywhere REJECT all -- anywhere loopback/8 reject-with icmp-port-unreachable ACCEPT all -- anywhere anywhere state RELATED,ESTABLISHED ACCEPT tcp -- anywhere anywhere tcp dpt:http ACCEPT tcp -- anywhere anywhere tcp dpt:https ACCEPT tcp -- anywhere anywhere state NEW tcp dpt:ssh ACCEPT udp -- anywhere anywhere udp dpt:domain ACCEPT tcp -- anywhere anywhere tcp dpt:domain ACCEPT icmp -- anywhere anywhere icmp echo-request LOG all -- anywhere anywhere limit: avg 5/min burst 5 LOG level debug prefix "iptables denied: " REJECT all -- anywhere anywhere reject-with icmp-port-unreachable Chain FORWARD (policy ACCEPT) target prot opt source destination REJECT all -- anywhere anywhere reject-with icmp-port-unreachable Chain OUTPUT (policy ACCEPT) target prot opt source destination ACCEPT all -- anywhere anywhere UPDATE: I've tried the following now in named.conf.options to bl
comentario Si mantenemos algun servidor DNS interno, puede que si nos vamos a mirar los logs de sistema, por ejemplo el daemon.log nos encontremos https://rubenlacasa.es/2014/04/09/errores-en-bind-unexpected-rcode-refused-resolving/ con alguno de estos errores producido desde el named: named[...]: unexpected RCODE (REFUSED) resolving '..':ipaddr#53 named[...]: unexpected RCODE (SERVFAIL) resolving '...': ipaddr#53 El primer error es debido a que el servidor que estamos usando como forwarders en el fichero named.conf.options nos esta denegando las solicitudes por algun motivo, en mi caso estos errores unexpected rcode me los estan devolviendo los servidores DNS de google tanto el 8.8.8.8 y el 8.8.4.4, luego el siguiente error es por que el servidor no contesta a nuestra petición. En ambos casos la solución mas sencilla es eliminar esos servidores y configurar otros nuevos como forwarders. http://www.itechlounge.net/2011/12/bind-unexpected-rcode-refused-resolving-xx-xx-xx-xx-in-addr-arpaptrin/ Compartir:Comparte en Facebook (Se abre en unexpected rcode refused una ventana nueva)Haz clic para compartir en Twitter (Se abre en una ventana nueva)Haz clic para compartir en Pinterest (Se abre en una ventana nueva)Haz clic para compartir en Pocket (Se abre en una ventana nueva)Haz clic aquà para compartir en LinkedIn (Se abre en una ventana nueva)Haz clic para compartir en Google+ (Se abre en una ventana nueva)Haz clic para compartir en Reddit (Se abre en una ventana nueva)MásClick to email (Se abre en una ventana nueva)Haz clic para imprimir (Se abre en una ventana nueva)Me gusta:Me gusta Cargando... Relacionado BindDNSRCODETecnologÃa Navegador de artÃculos Entrada anteriorFunción para eliminar los espacios no deseados dentro de un textoPróximo entradaCrea libros de programación y ejercicios con GitBook Deja un comentario Cancelar respuesta Introduce aquà tu comentario... Introduce tus datos o haz clic en un icono para iniciar sesión: Correo electrónico (necesario) (La dirección no se hará pública) Nombre (necesario) Web Estás comentando usando tu cuenta de WordPress.com. (CerrarsesiÃ