Azure App Service Deployment slot URL redirects to WWW and it does not load

SilvaPaulaD 56

Good morning; I have an app service, and the default azure URL redirect to www.defaultazureurl.com. Because of that redirect, the site never loads. I cannot find where the redirect is coming from or why it is doing that. Any help will be greatly appreciated to it.

brtrach-MSFT 16,676 Reputation points Microsoft Employee

2023-02-25T04:50:25.0166667+00:00

@SilvaPaulaD Please let us know if the below answer was helpful by marking it as an answer. If you have any questions or concerns please reply to this message and we will be happy to assist you.

1 answer

brtrach-MSFT 16,676 Reputation points Microsoft Employee

2023-02-24T02:13:43.6233333+00:00
@SilvaPaulaD We have a few scoping questions:

Has the deployment slot and its respective URL ever worked for you?

Do you have any services in front of your web app? Such as an App Gateway or Azure Front Door? If so, make sure your gateway is not configured to override the hostname. Further, you can try to see if your app has a www custom domain prefix.

Go to the App Service in the Azure portal.

Select the "Custom domains" option.

Check if there is a custom domain with a "www" prefix. If so, remove it.

Check if there is a redirect rule that is redirecting the root domain to the "www" subdomain. If so, remove it.

Note that this might change the behavior of your custom domain so perform these troubleshooting steps during slower hours for your site.

Let us know the outcome of these suggestions and if any resolved the issue. We look forward to your reply.
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SilvaPaulaD 56 Reputation points

2023-03-03T14:27:38.9533333+00:00

@brtrach-MSFT thanks for your response,

Has the deployment slot and its respective URL ever worked for you?

Yes, it has.

Do you have any services in front of your web app? Such as an App Gateway or Azure Front

I do not have front services.

Door? If so, ensure your gateway is not configured to override the hostname. Further, you can try to see if your app has a WWW custom domain prefix.

My app has a WWW custom domain, but that is for the client's URL, not for the azure default URL

Go to the App Service in the Azure portal.

Select the "Custom domains" option.

Check if there is a custom domain with a "WWW" prefix. If so, remove it.

Check if there is a redirect rule that redirects the root domain to the "WWW" subdomain. If so, remove it.

I do not have redirects in place.

brtrach-MSFT 16,676 Reputation points Microsoft Employee

2023-03-24T05:27:49.55+00:00

In that case, you can try the following steps to resolve the redirection issue:

Go to the Azure portal and navigate to your App Service.

Under the "Settings" section, select "Custom domains".

Check if there are any custom domains added to your App Service. If there are, make sure that the custom domain is correctly configured and that the DNS settings are correct.

If there are no custom domains added, you can try disabling the "HTTPS Only" setting under the "TLS/SSL settings" section. This setting can sometimes cause redirection issues.

If the issue persists, you can try adding a rewrite rule to your web.config file to redirect all requests to the non-www version of your URL. Here is an example of a rewrite rule that you can use:

<rule name="Redirect to non-www" stopProcessing="true"> <match url="(.*)" /> <conditions> <add input="{HTTP_HOST}" pattern="^www\.(.*)$" /> </conditions> <action type="Redirect" url="http://{C:1}/{R:1}" redirectType="Permanent" /> </rule>
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