Azure DNS
An Azure service that enables hosting Domain Name System (DNS) domains in Azure.
777 questions
Why are DNS changes not taking effect after several days? can't verify DNS from Mailgun
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Adam O'Neil
15
Reputation points
I'm hosting an application with Azure App Service with a custom domain, and it works.
I use Mailgun as an email provider for my application. To do that, you have to verify control of the domain name.
I entered the MX and TXT records in the DNS zone on the Azure portal for my application that Mailgun requires. It's been 4 days, and the changes are not showing up in public DNS checker tools. When I use nslookup in a terminal however, the MX records do show up, so I'm confused.
What am I missing? The net effect here is I can't use Mailgun to send email and have it showing as coming from my application domain, which is a problem.
Azure DNS
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VasimTamboli 5,215 Reputation points2023-06-04T11:48:17.93+00:00 Here are some possibilities to consider:
DNS propagation time: DNS changes can take time to propagate globally across DNS servers. While the changes may be visible to you through nslookup, it may take longer for public DNS checker tools to reflect the updates. In some cases, DNS propagation can take up to 48 hours or more, although it typically occurs within a few hours. It's worth waiting a bit longer to see if the changes eventually propagate.
TTL (Time-to-Live) values: The Time-to-Live value for your DNS records can affect how quickly the changes propagate. The TTL value specifies how long DNS resolvers should cache the DNS records before checking for updates. If the TTL value is set to a high number, it can result in longer propagation times. Check the TTL settings for your DNS records and consider reducing the value to expedite propagation.
Check DNS zone configuration: Ensure that you've correctly configured the DNS zone for your custom domain in the Azure portal. Double-check the MX and TXT records you've added and verify that they match the requirements specified by Mailgun. Pay attention to any specific formatting or syntax requirements. You can also try deleting and re-adding the DNS records to ensure they are correctly configured.
Verify domain ownership with Mailgun: Make sure you have followed the necessary steps to verify domain ownership with Mailgun. Check if there are any additional verification steps required by Mailgun beyond adding the DNS records. Confirm that you've completed the verification process correctly.
Confirm DNS provider: Verify that the DNS zone for your domain is managed by Azure DNS. In some cases, your domain may be registered with one DNS provider, but the DNS records are managed by another provider. Ensure that you are updating the DNS records in the correct DNS provider's control panel.
Check for DNS caching: DNS records can be cached at various levels, including your local machine, your ISP, and even intermediate DNS resolvers. Clear the DNS cache on your local machine and contact your ISP to inquire if they are caching the DNS records. If you have access to the DNS settings of your domain registrar, check if there are any DNS caching options enabled there.
If you have reviewed these points and the DNS changes still do not take effect, it may be beneficial to contact Azure support or your DNS provider for further assistance.
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KapilAnanth-MSFT 49,616 Reputation points Microsoft Employee Moderator2023-06-05T03:59:32.9+00:00 Welcome to the Microsoft Q&A Platform. Thank you for reaching out & I hope you are doing well.
Can you please use Dig web interface to check and share the results here?
(you can redact your domain name, just want to know if the resolution works or not)
Cheers,
Kapil
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KapilAnanth-MSFT 49,616 Reputation points Microsoft Employee Moderator
2023-06-06T03:58:19.3666667+00:00 May I know if you got a chance to review my previous comment?
Please let me know if you are facing any challenges or if there are any follow-up questions, I shall be glad to address them.
Thanks,
Kapil
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KapilAnanth-MSFT 49,616 Reputation points Microsoft Employee Moderator
2023-06-07T04:25:33.81+00:00 Can you please update us if the action plan provided was helpful?
Should there be any follow-up questions or concerns, please let us know and we shall try to address them.
Thanks,
Kapil
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Sam DS 0 Reputation points2023-08-31T09:25:27.3366667+00:00 Try dnschecker.org it gives you the accurate results in 24 - 48 hours. usually the changes are detected immediately.
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