![]() A few registry fun games didn't help too.Īny idea why it gives SERVFAIL instead of NXDOMAIN responses on queries without a. ![]() " dnscmd /config /enableednsprobes 0" doesn't make a difference. The LAN Adapter DNS-suffix does NOT have a influence on this, please don't suggest this.ĭisabling "cache protection" and "DNSSEC" don't make a difference. Is there a method to make the DNS Server appending a domain is the query only consists of a name without any "."? What is this making the DNS Server answering "SERVFAIL" instead of "NXDOMAIN" when I do a lookup of a name without any "." character in it? The forwarders are correctly set up (first gateway, then provider DNS). DNSSEC is not activated but accepted from forwarders. The nf is correctly set up, the DNS server seems to be free of errors too. flags: qr rd ra QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1 ![]() >HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 44139 Got SERVFAIL reply from 10.49.1.240, trying next server *** xxxxx wurde von nicht gefunden: Non-existent domain.īut using dig or nslookup from a linux box gives me following SERVFAIL instead of NXDOMAIN: ~]# nslookup xxxx This is what any windows client or a nslookup on the server is getting: C:\Users\Administrator>nslookup xxxxx The DNS Servers are on DCs, active directory integrated. As long as you have notifications enabled, you’ll receive a notification the first time a non-ServFail error occurs.This seems to be a strange behaviour when using dig or nslookup against server 2012 R2 DNS. This setting does not have any impact on notifications for other types of lookup failures, such as the wrong value being returned for a DNS record. I recommend keeping the default value in most situations, and adjusting it upward only as needed. This setting has a default value of “1”, and can be adjusted from your Notification Settings page. To address this issue (on the DNS monitoring side, at least), we’ve replaced our old “Suppress first ServFail notification” setting with a new setting which allows you to suppress notifications for anywhere from 0 to 10 consecutive ServFail errors: Our Updated ServFail Notification Suppression Feature I won’t call out specific DNS providers in this blog post, but there is a definite pattern in terms of which DNS providers have frequent ServFail errors. Unfortunately, this didn’t completely resolve the situation for some customers who have DNS providers with… less than stellar uptime. The number of ServFail related notifications plummeted, and for most users, the issue of ServFail related false positives disappeared. The majority of these ServFail errors were resolved 5 minutes later, when the DNS record in question was next checked. At the time, 57% of errors being reported were of the “ServFail” variety. This feature was introduced to cut down on false positives. This took the form of an account wide setting which when toggled on, suppressed notifications for ServFail errors unless two or more occurred in a row: It is exceedingly unlikely that these DNS queries are causing your machine to crash. 193.0.0.193 is one of RIPE's DNS servers which are authoritative for part of the in-addr.arpa tree used to map from IP to hostname. Last year we introduced a feature for suppressing isolated ServFail notifications. That syslog entry is most likely your machine trying to lookup the IP of a host that just connected to it. Some of these customers want to be notified if there’s any kind of issue, but others would rather not be about ServFail issues, unless they persist. Many of our customers use DNS Check to notify them via an email, page or chat bot when a monitored DNS record starts failing. ServFail Errors and DNS Record Monitoring ServFail errors happen, but should be rare. That said, if a name server has chronic ServFail issues, we recommend investigating why. This could have a number of causes, including an error on the DNS server itself, or a temporary networking issue.įortunately, most domains use multiple authoritative DNS servers, so if there is a short-lived ServFail issue on one name server which doesn’t impact the others, DNS lookups should still work. ServFail errors occur when there’s an error communicating with a DNS server. DNS record lookups can fail for a number of reasons, the most common of which is due what’s called a “ServFail” error.
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