Getting error "Our services aren't available right now" While configure Azure front door on top of Application gate way

Hello @Chinmaya Chhotaray ,

Welcome to Microsoft Q&A Platform. Thank you for reaching out & hope you are doing well.

I understand that you configured Azure Front Door in front of your Application gateway but you are getting the following error "Our services aren't available right now".

May I know how long has it been since you configured the Azure Front Door?

Azure Front Door Standard/Premium Endpoint takes 10 to 90 minutes to take effect.

So, it is recommended for customers to check back after 30 minutes to 2 hours to see if the issue has auto mitigated.

If the error is still presented after 3 hours, then we need to verify if the endpoint and origin mapping is correct.

Please check the HTTP status code that you are receiving when accessing the Front Door.

• HTTP 400 responses from Front Door with "Our services aren't available right now" error could appear before the AFD profile is fully provisioned or for domains/hostnames/protocols that are not registered in Front Door.
• The 400 error can happen if you have not configured a routing rule for the frontend host. A routing rule needs to be explicitly added for the custom domain. Refer: https://video2.skills-academy.com/en-us/azure/frontdoor/troubleshoot-issues#requests-sent-to-the-custom-domain-return-a-400-status-code
• If your environment is HTTPS only and you do not have a HTTP to HTTPS redirect, make sure that you are using HTTPS when you connect to the front door. Refer: https://video2.skills-academy.com/en-us/azure/frontdoor/troubleshoot-issues#azure-front-door-doesnt-redirect-http-to-https
• If you are using own SSL certificate, make sure that the certificate has a complete certificate chain with leaf and intermediate certificates, and root CA must be part of the Microsoft Trusted CA list. Refer: https://video2.skills-academy.com/en-us/azure/frontdoor/front-door-custom-domain-https#option-2-use-your-own-certificate
• 503 responses: If your AFD origin is configured as an IP address, then either disable "EnforceCertificateNameCheck" (not recommended) or change the origin from an IP address to an FQDN to which a valid certificate is issued that matches the origin certificate. Refer: https://video2.skills-academy.com/en-us/azure/frontdoor/troubleshoot-issues#my-origin-is-configured-as-an-ip-address

Kindly let us know if the above helps or you need further assistance on this issue.

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