![]() ![]() It wasn't really anything specific to DNS, but would cause subtle effects in a lot of places DNS was just the most visible thing failing. Packets that size cannot pass through the ADSL connection and to make matters worse, MTS apparently drops ICMP traffic (this could be my fault because it may be happening at the firewall box, which is theirs but was reconfigured by me), so that Path MTU Discovery (which would automatically adjust the setting) doesn't work. Here's the actual answer: The MTU on my Ethernet connection was set to the default of 1500. "The remote authoritative servers for these domains are misconfigured and you must contact the admins and tell them to fix the problem." Yes, I REALLY HAVE THE TIME AND ABILITY TO CONVINCE EVERY ADMINISTRATOR OF A MISCONFIGURED NAMESERVER ON THE ENTIRE INTERNET TO FIX THEIR CONFIGURATIONS BECAUSE THEY WILL ALL LISTEN TO ME! Also, of course, I can contact these administrators by pure mental telepathy, since my computer cannot connect to theirs to send them email.Ĭlearly, none of these answers was helpful. ![]() "You must be the authoritative server for these domains, and someone on the Net is trying to break into your nameserver." No, I really am not the authoritative server for these domains, the failing requests are coming from an authorized user on localhost (namely me), and incoming unauthorized DNS requests would be stopped at the firewall anyway."You must be the authoritative server for these domains, and you haven't given BIND the correct path to the zone files." No, I am not the authoritative server for these domains. #Rcode servfail how toSearching on the Web produced many people complaining about error messages like these, and the following answers on how to resolve it: The browser would hang, trying to connect, forever.ĭigging through the system logs revealed lines like these: Penny Arcade, Weather Underground, the Canada Revenue Agency, and the CBC, were the most annoying examples. Always the same sites little or no rhyme or reason to which ones they were. except just a few Web sites wouldn't work. So I set up my own caching DNS server and everything seemed fine. They offer opt-out but that doesn't work. Works pretty well, except they do that damn misguided "helpful" redirection of failed DNS requests to a search engine, thereby screwing up all non-Web activities that depend on the DNS actually working according to the protocol. The problem: new ADSL connection from MTS Allstream, which is the deregulated ghost of the Manitoba telecom monopoly. This is another one where I searched the net, the answers I found were very unhelpful, and so I'm posting what worked for me for the benefit of anyone making similar searches. | Home | インバルクと言うお祭り »įixing "unexpected RCODE (SERVFAIL)" and "unexpected RCODE (REFUSED)" This should make it easier to diagnose these sorts of issues.« Typographical history of the T. Note that OpenShift 4.10 adds an API to make it easier to increase CoreDNS's logging verbosity cf. Could you check the "coredns_forward_responses_total" metric to see whether the "forward" plugin is reporting SERVFAIL responses? ![]() I could be mistaken, but I don't believe this is the case as far as I can tell, the only cases in which CoreDNS's "forward" plugin returns a SERVFAIL response are if no upstream resolver can be reached or an upstream resolver returns a SERVFAIL response, and the only case in which CoreDNS's "kubernetes" plugin returns a SERVFAIL response is if CoreDNS hasn't synched with the Kubernetes API (which should only need to happen once when CoreDNS starts). Due to priorities and lack of capacity, we have still not been able to engage on this issue.īased on comment 25, it seems that at least in some cases the alert is legitimate, and that the application is sending spurious requests that elicit SERVFAIL responses from the upstream resolver.Ĭomment 21 asks whether CoreDNS could be reporting NXDOMAIN errors as SERVFAIL errors. ![]()
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