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

Ho, Keith D 80

Currently, I have setup an Azure Function App that is integrated with a Virtual Network. After I configured everything inside the Networking tab of my Function App, I run into the Error 403 - Forbidden and cannot access my Function App backend url anymore. The Networking settings I have configured include Public Network Access enabled from select virtual networks and IP addresses, Unmatched rule action denied, rules that include my ip address and the vnet, and inbound/outbound ip address. The URL I am trying to access is in the form https://<function-app>.azurewebsites.net/.

Ho, Keith D 80 Reputation points

2024-05-01T23:13:52.7533333+00:00

The function app backend url was working perfectly fine before I configured everything inside my Networking tab. However, I would like to keep my Networking settings configured.
Aki Nishikawa 805 Reputation points Microsoft Employee

2024-05-02T06:56:48.7066667+00:00

Hello Ho, Keith D, could you please elaborate your scenario? Particularly where did you access the app when HTTP 403 occurred? Component deployment diagram would be helpful to diagnose your issue.
Ho, Keith D 80 Reputation points

2024-05-02T17:29:56.74+00:00

When I try to make an API call to my function app, I run into the 403 error.
Ho, Keith D 80 Reputation points

2024-05-02T17:53:18.12+00:00

I got it fixed. I think the issue was with the IP addresses I was adding into my rules. I tried adding 8 different IP addresses and that got it working.
Aki Nishikawa 805 Reputation points Microsoft Employee

2024-05-03T02:20:53.3233333+00:00

Great! You got to the cause and fixed it by yourself!

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