{"id":2625,"date":"2019-10-22T17:31:42","date_gmt":"2019-10-22T09:31:42","guid":{"rendered":"https:\/\/www.mondoze.com\/guide\/?post_type=kb&#038;p=2625"},"modified":"2022-10-05T08:02:37","modified_gmt":"2022-10-05T00:02:37","slug":"dns-troubleshooting-faq","status":"publish","type":"kb","link":"https:\/\/www.mondoze.com\/guide\/kb\/dns-troubleshooting-faq","title":{"rendered":"DNS for Troubleshooting FAQ"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"2625\" class=\"elementor elementor-2625\" data-elementor-settings=\"[]\">\n\t\t\t\t\t\t<div class=\"elementor-inner\">\n\t\t\t\t\t\t\t<div class=\"elementor-section-wrap\">\n\t\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-14a7bd07 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"14a7bd07\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t\t\t<div class=\"elementor-row\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-39100493\" data-id=\"39100493\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-column-wrap elementor-element-populated\">\n\t\t\t\t\t\t\t<div class=\"elementor-widget-wrap\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-024e666 elementor-widget elementor-widget-heading\" data-id=\"024e666\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">DNS for Troubleshooting<\/h2>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-727b05e5 elementor-widget elementor-widget-text-editor\" data-id=\"727b05e5\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-text-editor elementor-clearfix\">\n\t\t\t\t<h3><strong>Why do I have a dc-######### subdomain?<\/strong><\/h3><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><p>Do not orange-cloud DNS records used to receive mail: Cloudflare does not proxy mail traffic by default.<\/p><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><p>For example, before using Cloudflare, suppose your DNS records for mail are as follows:<\/p><pre>example.com MX example.com\nexample.com A 192.0.2.1<\/pre><p>After using Cloudflare and proxying the\u00a0<em>A record<\/em>, CloudFlare will provide DNS responses with a Cloudflare IP (203.0.113.1 in the example below):<\/p><pre>example.com MX example.com\nexample.com A 203.0.113.1<\/pre><p>Since proxying mail traffic to Cloudflare would break your mail services, Cloudflare detects this situation and creates a dc-##### record:<\/p><pre>example.com MX dc-1234abcd.example.com\ndc-1234abcd.example.com A 192.0.2.1 \nexample.com A 203.0.113.1<\/pre><p>Removing the dc-###### record is only possible via one of these methods:<\/p><ul><li>If no mail is received for the domain, delete the\u00a0<em>MX record<\/em>.<\/li><li>update the <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><\/ul><pre>example.com MX mail.example.com\nmail.example.com A 192.0.2.1\nexample.com A 203.0.113.1<\/pre><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><hr \/><h3><strong>Why are DNS queries returning incorrect results?<\/strong><\/h3><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><ul><li>OpenDNS<\/li><li>Google<\/li><li>locally<\/li><\/ul><hr \/><h3><strong>No A, AAAA or CNAME record found?<\/strong><\/h3><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><p>Add the missing DNS records\u00a0to your domain.<\/p><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><hr \/><h3><strong>Why have I received an email:\u00a0<em>Your Name Servers have Changed<\/em>?<\/strong><\/h3><p>For domains where Cloudflare hosts the DNS, Cloudflare continuously checks whether the domain uses Cloudflare\u2019s nameservers for DNS resolution. If Cloudflare&#8217;s 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><p>Steps to resolve the issue require updating the DNS at your domain registrar to utilize the Cloudflare nameservers:<\/p><ol start=\"1\"><li>Follow the steps 2 and 3 within our\u00a0domain troubleshooting article.<\/li><li>Click\u00a0<strong>Re-check Now<\/strong>\u00a0in the Cloudflare UI\u00a0<strong>Overview<\/strong>\u00a0app.<\/li><\/ol>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>DNS for Troubleshooting 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 create a &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/www.mondoze.com\/guide\/kb\/dns-troubleshooting-faq\"> <span class=\"screen-reader-text\">DNS for Troubleshooting FAQ<\/span> Read More \u00bb<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}}},"kbtopic":[53],"kbtag":[110],"mkb_version":[],"_links":{"self":[{"href":"https:\/\/www.mondoze.com\/guide\/wp-json\/wp\/v2\/kb\/2625"}],"collection":[{"href":"https:\/\/www.mondoze.com\/guide\/wp-json\/wp\/v2\/kb"}],"about":[{"href":"https:\/\/www.mondoze.com\/guide\/wp-json\/wp\/v2\/types\/kb"}],"author":[{"embeddable":true,"href":"https:\/\/www.mondoze.com\/guide\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.mondoze.com\/guide\/wp-json\/wp\/v2\/comments?post=2625"}],"version-history":[{"count":6,"href":"https:\/\/www.mondoze.com\/guide\/wp-json\/wp\/v2\/kb\/2625\/revisions"}],"predecessor-version":[{"id":18710,"href":"https:\/\/www.mondoze.com\/guide\/wp-json\/wp\/v2\/kb\/2625\/revisions\/18710"}],"wp:attachment":[{"href":"https:\/\/www.mondoze.com\/guide\/wp-json\/wp\/v2\/media?parent=2625"}],"wp:term":[{"taxonomy":"kbtopic","embeddable":true,"href":"https:\/\/www.mondoze.com\/guide\/wp-json\/wp\/v2\/kbtopic?post=2625"},{"taxonomy":"kbtag","embeddable":true,"href":"https:\/\/www.mondoze.com\/guide\/wp-json\/wp\/v2\/kbtag?post=2625"},{"taxonomy":"mkb_version","embeddable":true,"href":"https:\/\/www.mondoze.com\/guide\/wp-json\/wp\/v2\/mkb_version?post=2625"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}