{"id":1692,"date":"2020-06-08T00:57:43","date_gmt":"2020-06-07T16:57:43","guid":{"rendered":"https:\/\/www.wesbytes.com\/guide\/?post_type=kb&#038;p=1692"},"modified":"2026-03-26T12:43:49","modified_gmt":"2026-03-26T04:43:49","slug":"dns-for-troubleshooting-faq","status":"publish","type":"kb","link":"https:\/\/www.servergigabit.com\/guide\/kb\/dns-for-troubleshooting-faq","title":{"rendered":"DNS for Troubleshooting FAQ: 6 Critical Solutions to Common DNS Issues"},"content":{"rendered":"<div class=\"mkb-anchor mkb-clearfix mkb-back-to-top-inline\">\n<h2><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone aligncenter\" src=\"https:\/\/ps.w.org\/faq-and-answers\/assets\/banner-772x250.png?rev=2566485\" alt=\"DNS for Troubleshooting FAQ\" width=\"1550\" height=\"500\" \/><\/h2>\n<h2><strong>DNS for Troubleshooting FAQ<\/strong><\/h2>\n<p>Here some DNS for Troubleshooting FAQ:<\/p>\n<h2 class=\"mkb-anchor__title\">Why do I have a dc-######### subdomain?<\/h2>\n<\/div>\n<p>The dc-##### subdomain is added to overcome a conflict created when your SRV or\u00a0<em>MX record<\/em>\u00a0resolves to a domain configured to proxy to Cloudflare.<\/p>\n<p>Do not orange-cloud DNS records used to receive mail: Cloudflare does not proxy mail traffic by default.<\/p>\n<p>Therefore, Cloudflare will create a dc-##### DNS record that resolves to the origin IP address. The dc-##### record ensures that traffic for your MX or SRV record isn\u2019t proxied (it directly resolves to your origin IP) while the Cloudflare proxy works for all other traffic.<\/p>\n<p>For example, before using Cloudflare, suppose your DNS records for mail are as follows:<\/p>\n<pre>example.com MX example.com\r\nexample.com A 192.0.2.1<\/pre>\n<p>After using Cloudflare and proxying the\u00a0<em>A record<\/em>, <a href=\"https:\/\/www.cloudflare.com\/\" rel=\"nofollow noopener\" target=\"_blank\">CloudFlare<\/a> will provide DNS responses with a Cloudflare IP (203.0.113.1 in the example below):<\/p>\n<pre>example.com MX example.com\r\nexample.com A 203.0.113.1<\/pre>\n<p>Since proxying mail traffic to Cloudflare would break your mail services, Cloudflare detects this situation and creates a dc-##### record:<\/p>\n<pre>example.com MX dc-1234abcd.example.com\r\ndc-1234abcd.example.com A 192.0.2.1 \r\nexample.com A 203.0.113.1<\/pre>\n<p>Removing the dc-###### record is only possible via one of these methods:<\/p>\n<ul>\n<li>If no mail is received for the domain, delete the\u00a0<em>MX record<\/em>.<\/li>\n<li>update the\u00a0<em>MX record<\/em>\u00a0to resolve to a separate\u00a0<em>A record<\/em>\u00a0for a mail subdomain that isn\u2019t proxied by Cloudflare:<\/li>\n<\/ul>\n<pre>example.com MX mail.example.com\r\nmail.example.com A 192.0.2.1\r\nexample.com A 203.0.113.1<\/pre>\n<p>If your mail server resides on the same IP as your web server, your\u00a0<em>MX record<\/em>\u00a0will expose your origin IP address.<\/p>\n<hr \/>\n<div class=\"mkb-anchor mkb-clearfix mkb-back-to-top-inline\">\n<h2 class=\"mkb-anchor__title\">Why are DNS queries returning incorrect results?<\/h2>\n<\/div>\n<p>Third-party tools can sometimes fail to return correct DNS results if a recursive DNS cache fails to refresh. In this circumstance, purge your public DNS cache via these methods:<\/p>\n<ul>\n<li>OpenDNS<\/li>\n<li>Google<\/li>\n<li>locally<\/li>\n<\/ul>\n<hr \/>\n<div class=\"mkb-anchor mkb-clearfix mkb-back-to-top-inline\">\n<h2 class=\"mkb-anchor__title\">No A, AAAA or CNAME record found?<\/h2>\n<\/div>\n<p><em>No A, AAAA or CNAME record found<\/em>\u00a0means the Cloudflare\u00a0<strong>DNS<\/strong>\u00a0app lacks proper records for DNS resolution.<\/p>\n<p>Add the missing DNS records\u00a0to your domain.<\/p>\n<p>Sites generally have at least an\u00a0<em>A record<\/em>\u00a0that points to the origin server IP address, typically for the\u00a0<em>www<\/em>\u00a0subdomain and the root domain.<\/p>\n<hr \/>\n<div class=\"mkb-anchor mkb-clearfix mkb-back-to-top-inline\">\n<h2 class=\"mkb-anchor__title\">Why have I received an email:\u00a0<em>Your Name Servers have Changed<\/em>?<\/h2>\n<\/div>\n<p>For domains where Cloudflare hosts the DNS, Cloudflare continuously checks whether the domain uses Cloudflare\u2019s nameservers for DNS resolution. If Cloudflare\u2019s nameservers are not used, the domain status is updated from\u00a0<em>Active<\/em>\u00a0to\u00a0<em>Moved<\/em>\u00a0in the Cloudflare\u00a0<strong>Overview<\/strong>\u00a0app and an email is sent to the customer.<\/p>\n<p>Steps to resolve the issue require updating the DNS at your domain registrar to utilize the Cloudflare nameservers:<\/p>\n<ol start=\"1\">\n<li>Follow the steps 2 and 3 within our\u00a0domain troubleshooting article.<\/li>\n<li>Click\u00a0<strong>Re-check Now<\/strong>\u00a0in the Cloudflare UI\u00a0<strong>Overview<\/strong>\u00a0app.<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<p>If you want to know more about General DNS Propagation Information, please refer <a href=\"https:\/\/www.servergigabit.com\/guide\/kb\/general-dns-propagation-information\">this article<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>DNS for Troubleshooting FAQ Here some DNS for Troubleshooting FAQ: Why do I have a dc-######### subdomain? The dc-##### subdomain is added to overcome a conflict created when your SRV or\u00a0MX record\u00a0resolves to a domain configured to proxy to Cloudflare. Do not orange-cloud DNS records used to receive mail: Cloudflare does not proxy mail traffic by default. Therefore, Cloudflare will&hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"kbtopic":[43],"kbtag":[1262,1393],"class_list":["post-1692","kb","type-kb","status-publish","hentry","kbtopic-cloudflare","kbtag-dns","kbtag-troubleshooting"],"_links":{"self":[{"href":"https:\/\/www.servergigabit.com\/guide\/wp-json\/wp\/v2\/kb\/1692","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.servergigabit.com\/guide\/wp-json\/wp\/v2\/kb"}],"about":[{"href":"https:\/\/www.servergigabit.com\/guide\/wp-json\/wp\/v2\/types\/kb"}],"author":[{"embeddable":true,"href":"https:\/\/www.servergigabit.com\/guide\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.servergigabit.com\/guide\/wp-json\/wp\/v2\/comments?post=1692"}],"version-history":[{"count":5,"href":"https:\/\/www.servergigabit.com\/guide\/wp-json\/wp\/v2\/kb\/1692\/revisions"}],"predecessor-version":[{"id":6406,"href":"https:\/\/www.servergigabit.com\/guide\/wp-json\/wp\/v2\/kb\/1692\/revisions\/6406"}],"wp:attachment":[{"href":"https:\/\/www.servergigabit.com\/guide\/wp-json\/wp\/v2\/media?parent=1692"}],"wp:term":[{"taxonomy":"kbtopic","embeddable":true,"href":"https:\/\/www.servergigabit.com\/guide\/wp-json\/wp\/v2\/kbtopic?post=1692"},{"taxonomy":"kbtag","embeddable":true,"href":"https:\/\/www.servergigabit.com\/guide\/wp-json\/wp\/v2\/kbtag?post=1692"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}