The intermediate certificate(s) should be bundled with server certificate and installed on the backend server. Version Independent ID: <---> Is there such a thing as "right to be heard" by the authorities? Otherwise, it will be marked as Unhealthy with this message. For details on this Openssl command you can refer toTroubleshoot backend health issues in Azure Application Gateway | Microsoft Docs , Look for the sub topic "Trusted root certificate mismatch". If Application Gateway can't establish a TCP session on the port specified, the probe is marked as Unhealthy with this message. The error says that Root cert is not whitelisted on the AppGW , but you might have a valid Third party certificate on the backend , and more over if you try to access the backend directly bypassing the Application Gateway you will not see any issues related to certificate in the browser. Configure that certificate on your backend server. You can add this to the application gateway to allow your backend servers for end to end TLS encryption. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Once the public key has been exported, open the file. The text was updated successfully, but these errors were encountered: @sajithvasu I am not aware of any changes that have been made on the App Gateway side that would make this not work. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. Follow steps 1-10 in the preceding section to upload the correct trusted root certificate to Application Gateway. Users can also create custom probes to mention the host name, the path to be probed, and the status codes to be accepted as Healthy. To Answer we need to understand what happens in any SSL/TLS negotiation. If the output doesnt show the complete chain of the certificate being returned, export the certificate again with the complete chain, including the root certificate. Applicaiton works fine on the backend servers with 443 certificate from Digicert. For File name, name the certificate file. This causes SSL/TLS negoatiation failure and AppGW marks the backend as unhealthy because it is not able to initiate the probe. In this example, we'll use a TLS/SSL certificate for the backend certificate, export its public key and then export the root certificate of the trusted CA from the public key in base64 encoded format to get the trusted root certificate. 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. If thats not a desired value, you should create a custom probe and associate it with the HTTP settings. Additionally, if you want to use a different text editor, understand that some editors can introduce unintended formatting in the background. Now, this is the frustrating partwithin IIS, all of my sites are bound too each specified certificate (sharing a single cert across all the sites wont work for this scenario because of the difference in SSL and URL names), What the MSFT document (https://docs.microsoft.com/en-us/azure/application-gateway/application-gateway-end-to-end-ssl-powershell) fails to tell you, is that you need a Default SITE binding to a certificate, without SNI ticked. 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. Solution: To resolve this issue, follow these steps: Learn more about Application Gateway probe matching. 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. To learn more visit https://aka.ms/authcertificatemismatch" I have some questions in regards to application gateway and need help with the same : I have the same issue, Root cert is DigiCert. Your email address will not be published. Sub-service: <---> site bindings in IIS, server block in NGINX and virtual host in Apache. How to Restart Windows Explorer Process in Windows 11? Open a command prompt (Win+R -> cmd), enter netstat, and select Enter. c. Check whether any NSG is configured. Cause: After Application Gateway sends an HTTP(S) probe request to the Select the root certificate and then select View Certificate. PS : Dont forget to upload the CER file to the HTTP settings in ApplicationGateway before you do the Health Check. Cause: Application Gateway resolves the DNS entries for the backend pool at time of startup and doesn't update them dynamically while running. Which language's style guidelines should be used when writing code that is supposed to be called from another language? Certificates required to allow backend servers - Azure Application Gateway Sharing best practices for building any app with .NET. More info about Internet Explorer and Microsoft Edge, https://learn.microsoft.com/en-us/azure/application-gateway/application-gateway-backend-health-troubleshooting, https://learn.microsoft.com/en-us/azure/application-gateway/certificates-for-backend-authentication#export-trusted-root-certificate-for-v2-sku, https://learn.microsoft.com/en-us/azure/application-gateway/ssl-overview#end-to-end-tls-with-the-v2-sku. By clicking Sign up for GitHub, you agree to our terms of service and Most of the best practice documentation involves the V2 SKU and not the V1. @EmreMARTiN , you mentioned your backend certificate is from "Digicert" which is already a well-known trusted CA. On the Details tab, select the Copy to File option and save the file in the Base-64 encoded X.509 (.CER) format. For example, check for routes to network virtual appliances or default routes being advertised to the Application Gateway subnet via Azure ExpressRoute and/or VPN. On the Export File Format page, select Base-64 encoded X.509 (.CER)., and then click Next. We are actually trying to simulate the Linux box as AppGW. Ensure that you add the correct root certificate to whitelist the backend. If it's not, the certificate is considered invalid, and that will create a If you can't connect on the port from your local machine as well, then: a. Solution: If your TLS/SSL certificate has expired, renew the certificate Ensure that you create a default website in the IIS with-in the VM without the SNI enabled and you should not see this error. In this article I am going to talk about one most common issue "backend certificate not whitelisted", If you check the backend health of the application gateway you will see the error like this "The root certificate of the server certificate used by the backend does not match the trusted root certificate added to the application gateway. Your email address will not be published. If the certificate wasn't issued by a trusted CA (for example, if a self-signed certificate was used), users should upload the issuer's certificate to Application Gateway. 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. Is that we have to follow the below step for resolution ? Which ability is most related to insanity: Wisdom, Charisma, Constitution, or Intelligence? If your certificate is working on browser directly hitting the app and not with AppGW then what is the exact problem? Message: The Common Name (CN) of the backend certificate doesn't match the host header of the probe. Configure that certificate on your backend server. 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. 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. rev2023.5.1.43405. 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. same situation as @JeromeVigne: App Gateway v1 as front-end to API Management, the health probe is unhealthy with the "Backend server certificate is not whitelisted with Application Gateway . Quickstart - Configure end-to-end SSL encryption with Azure Application Gateway - Azure portal, articles/application-gateway/end-to-end-ssl-portal.md, https://www.domstamand.com/end-to-end-ssl-solution-using-web-apps-and-azure-application-gateway-multisite-hosting/, https://learn.microsoft.com/en-us/azure/application-gateway/ssl-overview#for-probe-traffic, Version Independent ID: 948878b1-6224-e4c5-e65a-3009c4feda74. If they aren't, create a new rule to allow the connections. 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.
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