Azure web app custom domain problem

Question

Azure web app custom domain problem

Dr. Ahmed Qusay Sabri 11

i have an Azure web app and I give it a custom domain name like (www.mysite.com), then i change the custom domain name to the name (www.subdomin.mysite.com), the problem i can not reach the first domain name (www.mysite.com) it gives the following:

404 Web Site not found.
You may be seeing this error due to one of the reasons listed below :
Custom domain has not been configured inside Azure. See how to map an existing domain to resolve this.
Client cache is still pointing the domain to old IP address. Clear the cache by running the command ipconfig/flushdns.

Khushbu Kumari 0 Reputation points

2024-06-10T11:38:46.43+00:00

Hi @Ryan Hill , I am facing the same error even I am not using any custom domain can you please help with this.
Udaya Raja Thambidurai - v007839 0 Reputation points

2024-11-14T18:05:23.6033333+00:00

Where to execute this ipconfig command ?

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Khushbu Kumari 0 Reputation points

2024-06-10T11:38:46.43+00:00

Hi @Ryan Hill , I am facing the same error even I am not using any custom domain can you please help with this.
Udaya Raja Thambidurai - v007839 0 Reputation points

2024-11-14T18:05:23.6033333+00:00

Where to execute this ipconfig command ?

Answer 1

Ryan Hill 30,281 Microsoft Employee Moderator

Hi @Dr. Ahmed Qusay Sabri ,

Since your domain was working and you changed it, have a look at Migrate an active DNS name to Azure App Service documentation. You need to add a CNAME record that points www.subdomain.mysite.com to your app service in your DNS registrar. I would, however, suggest using a wildcard e.g. *.mysite.com assuming subdomain isn't a separate app service.

Dr. Ahmed Qusay Sabri 11 Reputation points

2021-09-24T16:11:01.78+00:00
Hi ryanchill,

first, I would like to thank you for your reply, actually, I have done all the correct technical steps needed to migrate the DNS name to the original host but Azure still kept the name, coincidently and after 24 hours from changing the hostname it is working now properly, I think Azure release the domain name within that period of time.

what I have learned from this issue:

apply a new Azure web app custom domain name taking only a few minutes.

delete the Azure web app custom domain name may take at least 24 hours. i.e. (Azure takes some time to release the domain name again for you).
Ryan Hill 30,281 Reputation points Microsoft Employee Moderator

2021-09-24T16:56:15.03+00:00

Gald to hear it. Sounds like you ran into this common issue. It isn't Azure pre se but just takes time for DNS changes to propagate. Rule of thumb is wait 48 hours and use WhatsMyDNS.net to check.

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Azure web app custom domain problem

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