If the backend health status is Unhealthy, the portal view will resemble the following screenshot: Or if you're using an Azure PowerShell, CLI, or Azure REST API query, you'll get a response that resembles the following example: After you receive an unhealthy backend server status for all the servers in a backend pool, requests aren't forwarded to the servers, and Application Gateway returns a "502 Bad Gateway" error to the requesting client. Set the destination port as anything, and verify the connectivity. Now how can find if my application sending the complete chain , the easy way to find is running openssl from either windows client or Linux client which is present in the same network/subnet of the backend application. The application is listeing in port 443. Application Gateway must be restarted after any modification to the backend server DNS entries to begin to use the new IP addresses. For a TLS/SSL certificate to be trusted, the backend server certificate must be issued by a CA that's included in the trusted store of Application Gateway. The status retrieved by any of these methods can be any one of the following states: If the backend health status for a server is healthy, it means that Application Gateway will forward the requests to that server. To do end to end TLS, Application Gateway requires the backend instances to be allowed by uploading authentication/trusted root certificates. b. Open the Application Gateway HTTP Settings page in the Azure portal. Find centralized, trusted content and collaborate around the technologies you use most. If the output doesn't show the complete chain of the certificate being returned, export the certificate again with the complete chain, including the root certificate. Message: Body of the backend's HTTP response did not match the Azure Applicaiton Gateway V2 Certification Issue, https://docs.microsoft.com/en-us/azure/application-gateway/certificates-for-backend-authentication#export-trusted-root-certificate-for-v2-sku, https://docs.microsoft.com/en-us/azure/application-gateway/ssl-overview#end-to-end-tls-with-the-v2-sku, Enabling end to end TLS on Azure Application Gateway, articles/application-gateway/ssl-overview.md, https://docs.microsoft.com/en-us/azure/cloud-shell/overview. Server will send its Certificate and because AppGW will already have its Root Cert, it verifies the backend server certificate and finds that it was issued by the Root cert which it is Trusting and they it starts connecting on HTTPs further for probing. Cause: After Application Gateway sends an HTTP(S) probe request to the If you have properly added the certificate, and the backend pool is pointing to the custom domain (not the azurewebsites.net domain), then your best options are to either try the V2 SKU, or open a support request to troubleshoot further. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. For more information about how to extract and upload Trusted Root Certificates in Application Gateway, see Export trusted root certificate (for v2 SKU). Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, Azure Application Gateway health probe error with "Backend server certificate is not whitelisted with Application Gateway", When AI meets IP: Can artists sue AI imitators? This month for new environment build we started encountering this problem. rev2023.5.1.43405. i raised ticket to Microsoft. Solution: Follow these steps to export and upload the trusted root certificate to Application Gateway. However when I replace all the 3 certificates to my CA cert, it goes red and warm me "Backend server certificate is not whitelisted with Application Gateway" Internal server error. If the port mentioned is not the desired port, enter the correct port number for Application Gateway to connect to the backend server. Few days back , I had to update the Azure backend certificate for authentication in the Application Gateway and i started noticing this error, Backend server certificate is not whitelisted with Application Gateway.. Now Clients will check the Server certificate and confirm if the certificate is issued by Trusted root or not. I am opening a PR to update the End-to-End Howto guide with a description of the error and a link to the SSL overview. Connect and share knowledge within a single location that is structured and easy to search. In this article I am going to talk about one most common issue "backend certificate not whitelisted" . On the App Gateway side, there are 6 public listeners are on the App Gateway with public .pfx certs, and 6 authentication certificates (.cer) within the HTTPsSettings, a single backendpool with both VMs configured, and various rules created. I have created an application gateway with 3 backend nodes, when I set the "Http Listener" with all the 3 nodes certificates, the health probe is green. Solution: To resolve this issue, follow these steps: Learn more about Application Gateway probe matching. For a TLS/SSL certificate to be trusted, that certificate of the backend server must be issued by a CA that's included in the trusted store of Application Gateway. An existing backend certificate is required to generate the authentication certificates or trusted root certificates required for allowing backend instances with Application Gateway. If your cert is issued by Internal Root CA , you would have export the root cert and import it the Trust Root Store in the Client. Received response body doesn't contain {string}. PS : Dont forget to upload the CER file to the HTTP settings in ApplicationGateway before you do the Health Check. In Azure docs, it is clearly documented that you dont have to import Auth certificate in HTTP settings of the backend if your backend application has Global trusted certificate. I had this same issue. @krish-gh actually it was actually what have i tried firstly but sitouiotion was same. If it is, check the DNS server about why it can't resolve to the IP address of the specified FQDN. In the Certificate properties, select the Details tab. Find out more about the Microsoft MVP Award Program. You can use any tool to access the backend server, including a browser using developer tools. For all TLS related error messages, to learn more about SNI behavior and differences between the v1 and v2 SKU, check the TLS overview page. This can create problems when uploaded the text from this certificate to Azure. If your cert is issued by Internal Root CA , you would have export the root cert and import it the Trust Root Store in the Client. If the output doesn't show the complete chain of the certificate being returned, export the certificate again with the complete chain, including the root certificate. By clicking Sign up for GitHub, you agree to our terms of service and To Answer we need to understand what happens in any SSL/TLS negotiation. This error can also occur if the backend server doesn't exchange the complete chain of the cert, including the Root > Intermediate (if applicable) > Leaf during the TLS handshake. what we are doing is actually trying to simulate the Linux box as AppGW as if that machine is trying probe to the backend server as AppGW. ID: <---> To verify that Application Gateway is healthy and running, go to the Resource Health option in the portal, and verify that the state is Healthy. It seems like something changed on the app gateway starting this month. If you are using Azure Application Gateway as Layer 7 WAF for End to End SSL connectivity , you might have come across Certificate related issues most of the times. Choose the destination manually as any internet-routable IP address like 1.1.1.1. See Configure end to end TLS by using Application Gateway with PowerShell. https://docs.microsoft.com/en-us/azure/application-gateway/application-gateway-end-to-end-ssl-powershell, Azure Cyber Security: Protect & Secure Your Cloud Infrastructure, Send Text & WhatsApp Messages for Azure VM Status with Azure Automation, Migrate SOAR Use Cases from Splunk to Microsoft Sentinel, Azure Defender and Azure Sentinel Alerts Bi-Directional Sync. When calculating CR, what is the damage per turn for a monster with multiple attacks? Application Gateway probes can't pass credentials for authentication. Select the root certificate and then select, In the Certificate properties, select the, Verify the CN of the certificate from the details and enter the same in the host name field of the custom probe or in the HTTP settings (if. privacy statement. Check whether the host name path is accessible on the backend server. site bindings in IIS, server block in NGINX and virtual host in Apache. i had this issue for client and split multiple vms ! Check the network security group (NSG) settings of the backend server's network adapter and subnet and whether inbound connections to the configured port are allowed. Allow the backend on the Application Gateway by uploading the root certificate of the server certificate used by the backend. Backend Health page on the Azure portal. Content Source:<---> with open ssl all looks okey i can see all chains. . The chain looks ok to me. (LogOut/ Solution: If you receive this error, follow these steps: Check whether you can connect to the backend server on the port mentioned in the HTTP settings by using a browser or PowerShell. But when we have multiple chain certificate and if your backend application/server sends only the leaf the certificate , AppGW will not be able to trust the cert up to the top level domain root. respond within the configured period (the timeout value), it's marked as Unhealthy until it starts responding within the configured timeout period again. Check whetheraccess to the path is allowed on the backend server. How to Allow or Prevent Themes to Change Desktop Icons in Desktop Icon Settings in Windows 11? ", The UDR on the Application Gateway subnet is set to the default route (0.0.0.0/0) and the next hop is not specified as "Internet.". Azure Tip #11 Get Reports of ARM Deployments in Your Subscription. Application Gateway doesn't provide you any mechanism to create or purchase a TLS/SSL certificate. We initially faced an issue with the certificate on the backend server which has since been sorted out by MS Support. Below is what happens during SSL negotiation when you have single chain cert and root in the AppGW. The authentication certificate is the public key of backend server certificates in Base-64 encoded X.509 (.CER) format. If you are using Azure Application Gateway as Layer 7 WAF for End to End SSL connectivity , you might have come across Certificate related issues most of the times. Check that the backend responds on the port used for the probe. Ensure that you add the correct root certificate to whitelist the backend". 566), Improving the copy in the close modal and post notices - 2023 edition, New blog post from our CEO Prashanth: Community is the future of AI. Microsoft Word Multiple Choice Questions & Answers, Excel Multiple Choice Questions & Answers, Different Ways to Change Power Button Action in Windows 11.
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