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Exercise - Configure an Application Gateway listener for encryption

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Now that you've configured the certificates for Azure Application Gateway and the backend pool, you can create a listener to handle incoming requests. The listener waits for messages, decrypts them by using the private key, then routes these messages to the backend pool.

In this unit, you'll set up the listener with port 443 and with the SSL certificate that you created in the first exercise. The following image highlights the elements you set up in this exercise.

Configure the listener

1. Run the following command to create a new frontend port (443) for the gateway:

   az network application-gateway frontend-port create \
     --resource-group $rgName \
     --gateway-name gw-shipping \
     --name https-port \
     --port 8443
   

2. Upload the SSL certificate for Application Gateway. The setup script generated this certificate in the previous exercise. The certificate is stored in the appgateway.pfx file in the server-config folder.

   The password generated for the .pfx file is somepassword. Don't change it in the following command.

   az network application-gateway ssl-cert create \
      --resource-group $rgName \
      --gateway-name gw-shipping \
      --name appgateway-cert \
      --cert-file server-config/appgateway.pfx \
      --cert-password somepassword
   

3. Run the following command to create a new listener that accepts incoming traffic on port 443. The listener uses the certificate appgateway-cert to decrypt messages.

   az network application-gateway http-listener create \
     --resource-group $rgName \
     --gateway-name gw-shipping \
     --name https-listener \
     --frontend-port https-port \
     --ssl-cert appgateway-cert
   

4. Run the following command to create a rule that directs traffic received through the new listener to the backend pool. This command might take a minute or two to finish.

   az network application-gateway rule create \
       --resource-group $rgName \
       --gateway-name gw-shipping \
       --name https-rule \
       --address-pool ap-backend \
       --http-listener https-listener \
       --http-settings https-settings \
       --rule-type Basic \
       --priority 102
   

Test the application gateway

1. Retrieve the public URL of the application gateway.

   echo https://$(az network public-ip show \
     --resource-group $rgName \
     --name appgwipaddr \
     --query ipAddress \
     --output tsv)
   

2. Go to the URL in a web browser.

   As before, your browser might display a warning message that says the SSL connection is using an unauthenticated certificate. This warning displays because the certificate is self-signed. You can ignore this warning and continue to the website.

3. Verify that the home page for the shipping portal appears.

You've configured the listener to listen on port 443 and decrypt the data that's ready to be passed to the backend pool. The data is re-encrypted when it's transmitted from the gateway to a server in the backend pool. With this listener in place, you've set up end-to-end encryption for the shipping portal.

You can delete these resources if needed. The easiest way to delete all the resources you created in this module is to simply delete the resource group.

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