Asking for help, clarification, or responding to other answers. The exported certificate looks similar to this: If you open the exported certificate using Notepad, you see something similar to this example. -> it has been taken from application servers by exporting as documented on Microsoft docs for WAF v2. If you receive this error message, the CN of the backend certificate doesn't match the host name configured in the custom probe, or the HTTP settings if Pick hostname from backend HTTP settings is selected. 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. Which language's style guidelines should be used when writing code that is supposed to be called from another language? Check whether the server is listening on the port that's configured. Learn how your comment data is processed. My issue was due to the root certificate not being presented to appgw, and resulted in the error: "The root certificate of the server certificate used by the backend does not match the trusted root certificate added to the application gateway. Thanks! Cause: If the backend pool is of type IP Address, FQDN or App Service, Application Gateway resolves to the IP address of the FQDN entered through DNS (custom or Azure default). here is the sample command you need to run, from the machine that can connect to the backend server/application. Allow the backend on the Application Gateway by uploading the root certificate of the server certificate used by the backend. Which was the first Sci-Fi story to predict obnoxious "robo calls"? 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. "backend server certificate is not whitelisted with application gateway .Make sure that the certificate uploaded to the application gateway matches with the certificate configured in the backend servers. Thanks. On the Export File Format page, select Base-64 encoded X.509 (.CER)., and then click Next. Most of the browsers are thick clients , so it may work in the new browsers but PRODUCTs like Application Gateway will not be able to trust the cert unless the backend sends the complete chain. 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. Most of the browsers are thick clients , so it may work in the new browsers but reverse proxies like Application Gateway wont behave like our browsers they only trust the certificates if the backend sends the complete chain. backend server, it waits for a response from the backend server for a configured period. Well occasionally send you account related emails. https://learn.microsoft.com/en-us/azure/application-gateway/certificates-for-backend-authentication#export-trusted-root-certificate-for-v2-sku, End-to-end TLS with the v2 SKU Now use steps 2-9 mentioned in the section Export authentication certificate from a backend certificate (for v1 SKU) above to export the trusted root certificate in the Base-64 encoded X.509(.CER) format. when the backend server cert hits AppGW after Server Hello , AppGW tries to check who issued the certificate and it finds that it was issued by . Hope this helps. If the certificate wasn't issued by a trusted CA (for example, a self-signed certificate was used), users should upload the issuer's certificate to Application Gateway. Azure Tip #7 What are the Storage Tiers in Azure ? -No client certificate CA names sent security issue in which Application Gateway marks the backend server as Unhealthy. For example: c. If it's not listening on the configured port, check your web server settings. Solution: If you receive this error message, there's a mismatch between the certificate that has been uploaded to Application Gateway and the one that was uploaded to the backend server. -verify error:num=19:self signed certificate in certificate chain @JeromeVigne did you find a solution in your setup? If there is, search for the resource on the search bar or under All resources. The application gateway then tries to connect to the server on the TCP port mentioned in the HTTP settings. During SSL negotiation , Client sends "Client Hello" and Server Responds with "Server Hello" with its Certificate to the Client. If the backend health is shown as Unknown, the portal view will resemble the following screenshot: This behavior can occur for one or more of the following reasons: Check whether your NSG is blocking access to the ports 65503-65534 (v1 SKU) or 65200-65535 (v2 SKU) from Internet: a. After you've figured out the time taken for the application to respond, select the. (LogOut/ And each pool has 2 servers . For more information about how to extract and upload Trusted Root Certificates in Application Gateway, see Export trusted root certificate (for v2 SKU). Select the root certificate and then select View Certificate. To verify, you can use OpenSSL commands from any client and connect to the backend server by using the configured settings in the Application Gateway probe. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. Next hop: Azure Firewall private IP address. Choose the destination manually as any internet-routable IP address like 1.1.1.1. If the backend server response for the probe request contains the string unauthorized, it will be marked as Healthy. Well occasionally send you account related emails. In this example, requests using TLS1.2 are routed to backend servers in Pool1 using end to end TLS. Expected:{HTTPStatusCode0} Received:{HTTPStatusCode1}. The default route is advertised by an ExpressRoute/VPN connection to a virtual network over BGP. We are actually trying to simulate the Linux box as AppGW. Connect and share knowledge within a single location that is structured and easy to search. d. To check the effective routes and rules for a network adapter, you can use the following PowerShell commands: If you don't find any issues with NSG or UDR, check your backend server for application-related issues that are preventing clients from establishing a TCP session on the ports configured. @sajithvasu I would continue to work with the support engineers while they look deeper into your authentication certificate. Note that this .CER file must match the certificate (PFX) deployed at the backend application. i had this issue for client and split multiple vms ! @TravisCragg-MSFT : Did you find out anything? Making sure your App Gateway has the authenticated cert installed on the HTTPs backend settings, with the appropriate Rules & Probe setup and bobs your uncle, I got full Health back, and all my sites were live and kicking. A pfx certificate has also been added. Once the public key has been exported, open the file. c. Check to see if there are any default routes (0.0.0.0/0) with the next hop not set as Internet. The chain looks ok to me. Also, please let me know your ticket number so that I can track it internally. of the server certificate used by the backend does not match the trusted root certificate added to the application gateway. How to Restart Windows Explorer Process in Windows 11? c. If the next hop is virtual network gateway, there might be a default route advertised over ExpressRoute or VPN. Making statements based on opinion; back them up with references or personal experience. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. If thats not a desired value, you should create a custom probe and associate it with the HTTP settings. Internal server error. To learn how to create NSG rules, see the documentation page. Message: The backend health status could not be retrieved. OpenSSL s_client -connect 10.0.0.4:443 -servername www.example.com -showcerts. We should get one Linux machine which is in the same subnet/VNET of the backend application and run the following commands. Application Gateway doesn't provide you any mechanism to create or purchase a TLS/SSL certificate. 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. For example, run the following command: Test-NetConnection -ComputerName www.bing.com -Port 443. If you can resolve the IP address, there might be something wrong with the DNS configuration in the virtual network. Follow steps 1a and 1b to determine your subnet. An Azure service that provides a platform-managed, scalable, and highly available application delivery controller as a service. 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" 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. How do I bypass Microsoft account login in Windows11? 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. 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. Error message shown - Backend server certificate is not whitelisted with Application Gateway. Enter any timeout value that's greater than the application response time, in seconds. "The root certificate of the server certificate used by the backend does not match the trusted root certificate added to the application gateway". b. From the properties displayed, find the CN of the certificate and enter the same in the host name field of the http settings. To resolve the issue, follow these steps. The message displayed in the Details column provides more detailed insights about the issue, and based on those details, you can start troubleshooting the issue. error. Ensure that you add the correct root certificate to whitelist the backend. 2)How should we get this issue fixed ? The backend certificate can be the same as the TLS/SSL certificate or different for added security. 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. with open ssl i should run the command on from local server ? But if this message is displayed, it suggests that Application Gateway couldn't successfully resolve the IP address of the FQDN entered. Is there such a thing as "right to be heard" by the authorities? . Hi @TravisCragg-MSFT : Were you able to check this? For more information about how to extract and upload Trusted Root Certificates in Application Gateway, see Export trusted root certificate (for v2 SKU). 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 am having the same issue with App GW v1 in front of an API Management. site bindings in IIS, server block in NGINX and virtual host in Apache. @einarasm read thru the responses from @krish-gh, specifically around leveraging OpenSSL toolkit to query the backend pool for the certificate trust chain, example: %> openssl s_client -connect 10.0.0.4:443 -servername www.example.com -showcerts. But when we have multiple chain certificate and your backend application is sending the Application Gateway only the leaf the certificate , AppGW will not be able to trust the cert up to the top level domain root. or is that all the backend pools has to serve the request for one application ? Cause: Every certificate comes with a validity range, and the HTTPS connection won't be secure unless the server's TLS/SSL certificate is valid. Have done s_client -connect backend_ip:443 -servername backend_url -showcerts and found that Root CA is missing. 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. The authentication certificate is the public key of backend server certificates in Base-64 encoded X.509 (.CER) format. 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. This will take some time to track down, fix, and the docs will need to be updated with limitations & best practices. To check the health of your backend pool, you can use the In this example, you'll use a TLS/SSL certificate for the backend certificate and export its public key to be used as . Client has renewed cert which is issued by GlobalSign and one of the listeners started to fail with same error. Document Details Message: Status code of the backend's HTTP response did not match the probe setting. This verification is Standard_v2 and WAF_v2 SKU (V2) behavior. This happens when an NSG/UDR/Firewall on the application gateway subnet is blocking traffic on ports 65503-65534 in case of v1 SKU, and ports 65200-65535 in case of the v2 SKU or if the FQDN configured in the backend pool could not be resolved to an IP address. Our configuration is similar to this article but we are using WAF V1 sku - https://www.domstamand.com/end-to-end-ssl-solution-using-web-apps-and-azure-application-gateway-multisite-hosting/ PS : Dont forget to upload the CER file to the HTTP settings in ApplicationGateway before you do the Health Check. If probes are routed through a virtual appliance and modified, the backend resource will display a 200 status code and the Application Gateway health status can display as Unknown. OpenSSL> s_client -connect 10.0.0.4:443 -servername www.example.com -showcerts Most of the browsers are thick clients , so it may work in the new browsers but reverse proxies like Application Gateway wont behave like our browsers they only trust the certificates if the backend sends the complete chain. Find out more about the Microsoft MVP Award Program. https://docs.microsoft.com/en-us/azure/application-gateway/ssl-overview#end-to-end-tls-with-the-v2-sku. Backend Health page on the Azure portal. Either allow "HTTP 401" in a probe status code match or probe to a path where the serverdoesn't require authentication. Trusted root certificate mismatch probe setting. with your vendor and update the server settings with the new We should get one Linux machine which is in the same subnet/VNET of the backend application and run the following commands. Cause: This error occurs when Application Gateway can't verify the validity of the certificate. How to organize your open apps in windows 11? certificate. Or, you can use Azure PowerShell, CLI, or REST API. 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. I can confirm that it's NOT a general issue or bug of the product. Application Gateway must be restarted after any modification to the backend server DNS entries to begin to use the new IP addresses. Sure I would be glad to get involved if needed. @TravisCragg-MSFT : Thank you! to your account. On the Application Gateway Overview tab, select the Virtual Network/Subnet link. Solution: Follow these steps to export and upload the trusted root certificate to Application Gateway. Otherwise please share the message in that scenario without adding root explicitly. Now you may ask why it works when you browse the backend directly through browser. Message: The Common Name (CN) of the backend certificate doesn't match the host header of the probe. Your certificate is successfully exported. here is what happens in in Multiple chain certificate. AppGW is a PaaS instance , by default you wont get access to the Applicaiton Gateway. Thanks for this information. As described earlier, the default probe will be to
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