Azure Static Web app certificate issues?

Question

Azure Static Web app certificate issues?

Emil Bergwik 30

This morning we started seeing an issue with navigating to any of our Static Web Apps in a browser saying "net::ERR_CERT_COMMON_NAME_INVALID" but we haven't changed anything in our configuration in Azure, nor in our DNS (which has CNAMEs for the custom domains).

In a terminal, I see the following output (below) when doing a openssl s_client -connect ourapp.ourdomain.com:443, which seems a bit suspicious because we're not on an azurewebsites.net domain (those are for App Services afaik), I would expect an azurestaticapps.net CN here, no?

Certificate chain

0 s:C = US, ST = WA, L = Redmond, O = Microsoft Corporation, CN = *.msha-slice-7-hk1-1-ase.p.azurewebsites.net

Vimal Lalani 500 Reputation points Microsoft External Staff Moderator

2025-08-22T13:52:03.3733333+00:00

Hi @Emil Bergwik

Thank you for posting your question on Q&A.

From your description, it seems that you are experiencing SSL certificate issues with Azure Static Web Apps, where navigating to your application results in a net::ERR_CERT_COMMON_NAME_INVALID error. You have also noticed that the certificate’s CN is pointing to an azurewebsites.net domain, which looks unexpected for a Static Web App.

Our engineering teams are actively investigating and addressing the underlying causes that are impacting Static Web App availability.

In the meantime, some customers have reported temporary workarounds such as creating a new Static Web App instance and re-adding their custom domains, which triggered the provisioning of new SSL certificates and helped restore access.

Please note that deleting and re-adding custom domains alone has not consistently resolved the issue.

Please feel free to post back if you have further questions or if the issue continues after trying the suggested approaches.
Emil Bergwik 30 Reputation points

2025-08-22T14:01:53.15+00:00

All our services are back again (without doing anything). Would be nice with an RCA on this one as our hands were more or less tied (without resorting to creating an entirely new static web app which someone suggested) or going for enterprise edge.

1 answer

Your answer

Vimal Lalani 500 Reputation points Microsoft External Staff Moderator

2025-08-22T13:52:03.3733333+00:00

Hi @Emil Bergwik

Thank you for posting your question on Q&A.

From your description, it seems that you are experiencing SSL certificate issues with Azure Static Web Apps, where navigating to your application results in a net::ERR_CERT_COMMON_NAME_INVALID error. You have also noticed that the certificate’s CN is pointing to an azurewebsites.net domain, which looks unexpected for a Static Web App.

Our engineering teams are actively investigating and addressing the underlying causes that are impacting Static Web App availability.

In the meantime, some customers have reported temporary workarounds such as creating a new Static Web App instance and re-adding their custom domains, which triggered the provisioning of new SSL certificates and helped restore access.

Please note that deleting and re-adding custom domains alone has not consistently resolved the issue.

Please feel free to post back if you have further questions or if the issue continues after trying the suggested approaches.
Emil Bergwik 30 Reputation points

2025-08-22T14:01:53.15+00:00

All our services are back again (without doing anything). Would be nice with an RCA on this one as our hands were more or less tied (without resorting to creating an entirely new static web app which someone suggested) or going for enterprise edge.

Answer 1

Vimal Lalani 500 Microsoft External Staff Moderator

Hi Emil Bergwik

This incident was due to a temporary platform issue within Azure Static Web Apps that affected multiple regions between 09:35 UTC and 13:33 UTC on 22nd August 2025. During this time, customers may have encountered HTTP 404 errors or certificate warnings due to a configuration change at the platform level. The issue was mitigated by Microsoft, and services were restored.

Share via

Azure Static Web app certificate issues?

1 answer

Your answer