How to fix communication problem between Application Gateway and Container App?

Hello @Manjeet Kaur ,

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

As mentioned in the Application gateway documents,

If you receive a probe status code mismatch: 403 - Access forbidden error, you need to check whether access to the path is allowed on the backend server.

Refer: https://video2.skills-academy.com/en-us/azure/application-gateway/application-gateway-backend-health-troubleshooting#http-status-code-mismatch

You can also encounter HTTP 403 Forbidden error if you are utilizing WAF skus and have WAF configured in Prevention mode. If enabled WAF rulesets or custom deny WAF rules match the characteristics of an inbound request, the client is presented a 403 forbidden response.

Refer: https://video2.skills-academy.com/en-us/azure/application-gateway/http-response-codes#403--forbidden

Could you please provide some more details regarding your Application gateway configuration:

• Which App gateway SKU are you using?
• What is the listener, backend http settings, rules and probe configuration of your App gateway?
• Also, could you please share the backend health of your Application gateway?

Refer: https://video2.skills-academy.com/en-us/azure/application-gateway/application-gateway-backend-health-troubleshooting#how-to-check-backend-health

Regards,

Gita