multiple chain certificate and if your backend application/server sends only the leaf the certificate , AppGW . The HTTP setting of the gateway is configured as follow: I've provided, hopefully, the correct root certificate for the setting. 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. Ended up swapping to App Gateway V2 instead using the Trusted CA cert option on the backend http settings. How to Change Network Location to Private, Public, or Domain in Windows 11? If the port mentioned is not the desired port, enter the correct port number for Application Gateway to connect to the backend server. 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. The exported certificate looks similar to this: If you open the exported certificate using Notepad, you see something similar to this example. Fast-forward 2022, we are also faced with the same issue and getting the same error "Backend server certificate is not whitelisted with Application Gateway" using Application Gateway v1. Below is what happens during SSL negotiation when you have single chain cert and root in the AppGW. For File name, name the certificate file. If that's not the desired host name for your website, you must get a certificate for that domain or enter the correct host name in the custom probe or HTTP setting configuration. Message: The root certificate of the server certificate used by the backend does not match the trusted root certificate added to the application gateway. We initially faced an issue with the certificate on the backend server which has since been sorted out by MS Support. 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? 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. I will post the root cause summary once there is an outcome from your open support case. Service: application-gateway; GitHub Login: @vhorne; Microsoft Alias: absha; The text was updated successfully, but these errors were encountered: . How did you verify the cert? backend server, it waits for a response from the backend server for a configured period. (LogOut/ 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. here is the IP is your backend Application IP , it changes as per your backend pool you can use even use the hostname directly here. If there's a custom DNS server configured on the virtual network, verify that the servers can resolve public domains. I will post any updates here as soon as I have them. More info about Internet Explorer and Microsoft Edge, Export trusted root certificate (for v2 SKU), Overview of TLS termination and end to end TLS with Application Gateway, Application Gateway diagnostics and logging. to your account. 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. 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. After the server starts responding An existing backend certificate is required to generate the authentication certificates or trusted root certificates required for allowing backend instances with Application Gateway. @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. Not the answer you're looking for? Thanks for this information. 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. Otherwise please share the message in that scenario without adding root explicitly. Select No, do not export the private key, and then click Next. OpenSSL s_client -connect 10.0.0.4:443 -servername www.example.com -showcerts. This will take some time to track down, fix, and the docs will need to be updated with limitations & best practices. Sure I would be glad to get involved if needed. https://docs.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 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. craigclouditpro your a lifesaver thanks for posting this friend ! Have a question about this project? In this example, you'll use a TLS/SSL certificate for the backend certificate and export its public key to be used as . By default, Azure Application Gateway probes backend servers to check their health status and to check whether they're ready to serve requests. 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.. Public domain name resolution might be required in scenarios where Application Gateway must reach out to external domains like OCSP servers or to check the certificates revocation status. Check whetheraccess to the path is allowed on the backend server. If you're using a default probe, the host name will be set as 127.0.0.1. Version Independent ID: d85aa8fe-7270-d073-ea56-d1c0759383b8. 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 Answer we need to understand what happens in any SSL/TLS negotiation. here is the sample command you need to run, from the machine that can connect to the backend server/application. 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. Cause: End-to-end SSL with Application Gateway v2 requires the backend server's certificate to be verified in order to deem the server Healthy. The certificate added to Backend HTTP Setting to authenticate the backend servers can be the same as the certificate added to the listener for TLS termination at application gateway or different for enhanced security. If you're using Azure default DNS, check with your domain name registrar about whether proper A record or CNAME record mapping has been completed. Solution: To resolve this issue, verify that the certificate on your server was created properly. here is the sample command you need to run, from the machine that can connect to the backend server/application. 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. 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. Azure Tip #3 What is Scale up and Scale Out ? rev2023.5.1.43405. c. Check whether any NSG is configured. Open a command prompt (Win+R -> cmd), enter netstat, and select Enter. The current data must be within the valid from and valid to range. 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. -verify error:num=19:self signed certificate in certificate chain 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. There is ROOT certificate on httpsettings. Ensure that you add the correct root certificate to whitelist the backend". We should get one Linux machine which is in the same subnet/VNET of the backend application and run the following commands. Currently we are seeing issues with app gateway backend going unhealthy due to backend auth cert. After CA autohority re-created the certificate problem was gone. Ensure that you add the correct root certificate to whitelist the backend". 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. successfully, Application Gateway resumes forwarding the requests. You can add this to the application gateway to allow your backend servers for end to end TLS encryption. This post has been republished via RSS; it originally appeared at: New blog articles in Microsoft Tech Community. i.e. 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. Do not edit this section. Content: <---> For example: c. If it's not listening on the configured port, check your web server settings. If your certificate is working on browser directly hitting the app and not with AppGW then what is the exact problem? When I use v2 SKU with the option to trust the backend certificate from APIM it works. On the Application Gateway Overview tab, select the Virtual Network/Subnet link. 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 you are not familiar with Cloud Shell, it allows you to access bash or powershell from your browser to run commands within your Azure subscription https://docs.microsoft.com/en-us/azure/cloud-shell/overview. For the server certificate to be trusted we need the Root certificate in Trusted Root Cert Store , usually if you are having certs issued by Godaddy,Digicert,Vergion like Third party Vendors you dont have to do anything because they are automatically trusted by your client/browser. Passing negative parameters to a wolframscript. You'll see the Certificate Export Wizard. certificate. 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. Change the host name or path parameter to an accessible value. to your account. I did not find this error message listed here https://learn.microsoft.com/en-us/azure/application-gateway/application-gateway-backend-health-troubleshooting. One pool has 2 servers listed as unhealthy and the error message we see is below: "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. Ive deployed 2 Virtual Machines in North Europe (Across Zones 1 and 2) both configured with IIS with 6 sites with different URLs (all with Server Name Indication ticked) installed all the certificates to match their names as-well. 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" The reason why I try to use CA . By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Nice article mate! Azure Tip #10 Load Balancer vs Traffic Manager, Azure Tip #2 Azure Free Subscription without CreditCard for Learning Sandbox, Azure Charts All about Azure news, stats, and Changes, 100 Multiple Choice Questions & Answers on Microsoft Outlook, 100 Multiple Choice Questions & Answers on PowerPoint. This can create problems when uploaded the text from this certificate to Azure. 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 . document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. c. Check to see if there are any default routes (0.0.0.0/0) with the next hop not set as Internet. If you can resolve it, restart Application Gateway and check again. To check the health of your backend pool, you can use the It seems like something changed on the app gateway starting this month. @TravisCragg-MSFT: I have same configuration on different places which were built a while ago and those are perfectly working fine. Check whether the virtual network is configured with a custom DNS server. thank you for sharing it . Cause: End-to-end SSL with Application Gateway v2 requires the backend server's certificate to be verified in order to deem the server Healthy. An issue with your configuration needs to be ruled out first. This doesn't indicate an error. To resolve the issue, follow these steps. Ive recently faced with the dreaded 502 Web Server error when dealing with the App Gateway, my Backend Health was screaming unhealthy Backend server certificate is not whitelisted with Application Gateway. 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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