Dns Error Servfail Rcode 2
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server: "192.168.1.4", domain: "213.109.179.151", record type: PTR, protocol: UDP. Server response: DNS server or domain failure (SERVFAIL, RCODE 2).and then the email that generated the warning goes on error unexpected rcode servfail to pass checks and be delivered, and it is invariably spam. How can error unexpected rcode servfail resolving I stop these from getting through? Reply by jerminate 3 years ago 2 @jerminate: The typical reason for SERVFAIL DNS named unexpected rcode servfail responses is that the authoritative DNS name server for the zone being looked up is down or otherwise non-responsive. There is practically nothing you can do about these, because these are servers belong
Dns Response Codes
to other organizations. However, if you receive these SERVFAIL messages for practically all non-whitelisted emails with varied ORF tests, it may be a problem with your DNS server.It may also appear that the above message causes the email to be delivered, but actually that is not the case. The error handling policy of ORF for blacklists tests is to skip the smallest possible part of a test dns server failure response code 2 when an error is encountered and continue with the next test. DNS errors in particular are expected and like all errors, they will be treated this way.In any case, I recommend reviewing our best practices guide for improving spam filtering performance and DNS configuration: http://vamsoft.com/support/docs/how-tos/best-practices-5.0.Please let me know if you have any questions. Reply by Péter Karsai (Vamsoft) 3 years ago (in reply to this post) 3 @Péter Karsai (Vamsoft): I am not receiving these SERVFAIL messages for practically all non-whitelisted email, but I am getting several (10-15) an hour, and the messages do indeed invariably PASS after I receive this message. Users reporting 15+ spams a day alerted me to this issue, and when I check the logs I see the SERVFAIL message, and then immediately after that in the logs is a PASS message where ORF lets it through. These are obvious spam messages - I cut down on them a bit by blocking *@*.in, but they are for things like Cheap Mortgages and the like. I believe this issue began when I upgraded to ORF 5, and our spam detection rates have gone from 91% to 78%. Reply by jeremy.ward 3 years ago (in reply t
the OpenDNS Block Page IP Addresses? How do I block Skype with OpenDNS? Why does the OpenDNS IP Updater dns refused response connect to Google/Appspot? How do I access my Invoice (Home VIP
Dns Server Refused A Request(code 5)
Users) FAQ: How OpenDNS handles .cm DNS requests FAQ: What are common DNS return or response
Dns Error Codes
codes? How to: Enforcing Google SafeSearch See more FAQ: What are common DNS return or response codes? Matt Prytuluk Updated September 26, 2016 15:36 The following table http://vamsoft.com/forum/topic/406/record-type-ptr-protocol-udp-server-response-dns-server-or-domain-failure-servfail-rcode-2 explains the DNS return codes that can be returned when doing a DNS query and may appear in your logs. Each return code has its own purpose in the DNS infrastructure. Typically, you'll see NOERROR (RCODE:0) when doing most of your successful browsing, all of the other return codes are consider errors. For an https://support.opendns.com/entries/60827730-FAQ-What-are-common-DNS-return-or-response-codes- exhaustive list of these codes, please see theDNS RCODEs section of this link: http://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml DNS Return Message DNS Response Code Function NOERROR RCODE:0 DNS Query completed successfully FORMERR RCODE:1 DNS Query Format Error SERVFAIL RCODE:2 Server failed to complete the DNS request NXDOMAIN RCODE:3 Domain name does not exist. For help resolving this error, read here. NOTIMP RCODE:4 Function not implemented REFUSED RCODE:5 The server refused to answer for the query YXDOMAIN RCODE:6 Name that should not exist, does exist XRRSET RCODE:7 RRset that should not exist, does exist NOTAUTH RCODE:8 Server not authoritative for the zone NOTZONE RCODE:9 Name not in zone Facebook Twitter LinkedIn Google+ Was this article helpful? 0 out of 0 found this helpful Have more questions? Submit a request Return to top Related articles Domain resolving with NXDOMAIN or incorrect IP address FAQ: OpenDNS Developer Resources FAQ: what are the DNS Request Types? Ubuntu Windows 7 Comments 0 comments Article is closed for comments. OpenDNS
Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn http://serverfault.com/questions/353589/windows-dns-server-2008-r2-fallaciously-returns-servfail more about hiring developers or posting ads with us Server Fault Questions Tags Users Badges Unanswered Ask Question _ Server Fault is a question and answer site for system 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 Windows DNS Server 2008 R2 fallaciously returns SERVFAIL up vote 7 down vote unexpected rcode favorite 1 I have a Windows 2008 R2 domain controller which is also a DNS server. When resolving certain TLDs, it returns a SERVFAIL: $ dig bogus. ; <<>> DiG 9.8.1 <<>> bogus. ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 31919 ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;bogus. IN A I get the same result for a real TLD like unexpected rcode servfail com. when querying the DC as shown above. Compare to a BIND server that is working as expected: $ dig bogus. @128.59.59.70 ; <<>> DiG 9.8.1 <<>> bogus. @128.59.59.70 ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 30141 ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0 ;; QUESTION SECTION: ;bogus. IN A ;; AUTHORITY SECTION: . 10800 IN SOA a.root-servers.net. nstld.verisign-grs.com. 2012012501 1800 900 604800 86400 ;; Query time: 18 msec ;; SERVER: 128.59.59.70#53(128.59.59.70) ;; WHEN: Wed Jan 25 14:09:14 2012 ;; MSG SIZE rcvd: 98 Similarly, when I query my Windows DNS server with dig . any, I get a SERVFAIL but the BIND servers return the root zone as expected. This sounds similar to the issue described in http://support.microsoft.com/kb/968372 except I am using two forwarders (128.59.59.70 from above as well as 128.59.62.10) and falling back to root hints so the preconditions to expose the issue are not the same. Nevertheless, I also applied the MaxCacheTTL registry fix as described and restarted DNS and the whole server as well but the problem persists. The problem occurs on all domain controllers in this domain and has occurred since half a year ago, even though the servers are getting automatic Windows updates. EDIT Here is a debug log. The client is 160.39.114.110, which is my workstation. 1/25/2012 2:16:01 PM 0E