Azure App Service Returns Error - Error 403 - Forbidden The web app you have attempted to reach has blocked your access

Question

I am getting error while accessing the Azure App Service, can you help in resolving the issue ?

What setting to be applied to resolve the issue ?

Thanks in advance.

Answer 1

This error comes either

• When the public access is not allowed on Azure App Service, if you have open public API.
• The IP of your application with which you are calling the app service is not whitelisted.
• If you have any gateway in between then that may also be blocking your calls.

Solutions to try:

• Try removing the access restrictions from Networking page of your web app.

  

• Try giving the access to all by adding 0.0.0.0/0. Later you can add restrictions based on your requirements.

• The sequence of the restrictions matters, so please check that once. If you have any blocked call before any allowed call, then it may impact.

• You can also have restrictions based on http-headers like X-Forwarded-For. Please check that once. This can happen from code as well, based on how you handle the errors. Link

• If your API is behind the Gateway, then you can check this: Application Gateway integration with service endpoints