The reason why I try to use CA cert is that I manage all the resource in terraform, with a single CA cert, it is better to automate the process. For example, http://127.0.0.1:80 for an HTTP probe on port 80. In each case, if the backend server doesn't respond successfully, Application Gateway marks the server as Unhealthy and stops forwarding requests to the server. If the null hypothesis is never really true, is there a point to using a statistical test without a priori power analysis? "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. Azure Nwtworking> Azure Application Gateway: 502 error due to backend certificate not whitelisted in the AppGW, https://techcommunity.microsoft.com/t5/azure-networking-blog/azure-application-gateway-502-error-due-to-backend-certificate/ba-p/3271805, 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. Well occasionally send you account related emails. Select the root certificate and then select View Certificate. Or, you can use Azure PowerShell, CLI, or REST API. Backend Authentication certificate issue #40941 - Github The v2 SKU is not an option at the moment due to lack of UDR support. 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. c. Check whether any NSG is configured. The protocol and destination port are inherited from the HTTP settings. 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 . 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. site bindings in IIS, server block in NGINX and virtual host in Apache. You can add this github issue reference in your ticket so that the Azure support personnel can see the details without asking you to repeat these steps. Just FYI. The gateway listener is configured to accept HTTPS connections. And each pool has 2 servers . There is certificate with private key as PFX on listenner settings. 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. 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. i.e. d. If an NSG is configured, search for that NSG resource on the Search tab or under All resources. Every documentation page has a feedback section at the bottom. #please-close. 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. . Is that we have to follow the below step for resolution ? But if this message is displayed, it suggests that Application Gateway couldn't successfully resolve the IP address of the FQDN entered. 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. Application Gateway probes can't pass credentials for authentication. In the v2 SKU, if there's a default probe (no custom probe has been configured and associated), SNI will be set from the host name mentioned in the HTTP settings. How to Allow or Prevent Themes to Change Desktop Icons in Desktop Icon Settings in Windows 11? Choose the destination manually as any internet-routable IP address like 1.1.1.1. If you've already registered, sign in. Now how do we find if my application/backendserver is sending the complete chain to AppGW? (LogOut/ Microsoft Word Multiple Choice Questions & Answers, Excel Multiple Choice Questions & Answers, Different Ways to Change Power Button Action in Windows 11. Ensure that you add the correct root certificate to whitelist the backend. The -servername switch is used in shared hosting environments. In the Certificate properties, select the Details tab. 2)How should we get this issue fixed ? Making statements based on opinion; back them up with references or personal experience. Configure that certificate on your backend server. 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. You can use any tool to access the backend server, including a browser using developer tools. See Configure end to end TLS by using Application Gateway with PowerShell. It seems like something changed on the app gateway starting this month. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Design a site like this with WordPress.com, Troubleshoot backend health issues in Azure Application Gateway | Microsoft Docs. Did the drapes in old theatres actually say "ASBESTOS" on them? Can you recreate this scenario in your lab using multi-site and custom domain on appservices with SNI bind SSL and cert issued by different CA than Microsoft and not the default azurewebsites.net and you may hit this issue? Well occasionally send you account related emails. Backend Health page on the Azure portal. 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. Can you please add reference to relevant Microsoft Docs page you are following? 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. For File to Export, Browse to the location to which you want to export the certificate. This month for new environment build we started encountering this problem. OpenSSL s_client -connect 10.0.0.4:443 -servername www.example.com -showcerts. 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. 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. From your TLS/SSL certificate, export the public key .cer file (not the private key). To do that, follow these steps: Message: The validity of the backend certificate could not be verified. Do not edit this section. Alternatively, you can do that through PowerShell/CLI. xcolor: How to get the complementary color. It is required for docs.microsoft.com GitHub issue linking. 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 Intermediate certificate but then it does not have information about Intermediate cert, like who issued the cert and what is the root certificate of that intermediate certificate. A pfx certificate has also been added. b. If the domain is private or internal, try to resolve it from a VM in the same virtual network. Sign in @JeromeVigne did you find a solution in your setup? Or, if Pick host name from backend address is mentioned in the HTTP settings, where the backend address pool contains a valid FQDN, this setting will be applied. b. Check whether the host name path is accessible on the backend server. To learn more visit https://aka.ms/authcertificatemismatch" I have some questions in regards to application gateway and need help with the same : Document Details I just set it up and cannot get the health probe for HTTPS healthy. 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. Ensure that you add the correct root certificate to whitelist the backend". Hope this helps. Sign up for a free GitHub account to open an issue and contact its maintainers and the community. or from external over WAF ? You can find this by running openssl from either windows client or Linux client which is present in the same network/subnet of the backend application. The section in blue contains the information that is uploaded to application gateway. Export trusted root certificate (for v2 SKU): I have two listeners and my issue has started on one of them when SSL certificate has been renewed. If the setting is either Virtual Appliance or Virtual Network Gateway, you must make sure that your virtual appliance, or the on-premises device, can properly route the packet back to the Internet destination without modifying the packet. Message: Status code of the backend's HTTP response did not match the probe setting. with your vendor and update the server settings with the new Solution: To resolve this issue, follow these steps: Learn more about Application Gateway probe matching. Posted in Azure Tagged 502webserver, Azure, azure502, azureapplicationgateway, azurecertificate, azurewaf, backend certificate not whitelisted Post navigation Azure Cyber Security: Protect & Secure Your Cloud Infrastructure This causes SSL/TLS negoatiation failure and AppGW marks the backend as unhealthy because it is not able to initiate the probe. The root certificate is a Base-64 encoded X.509(.CER) format root certificate from the backend server certificates. I will post any updates here as soon as I have them. By clicking Sign up for GitHub, you agree to our terms of service and Move to the Details view and click Copy to File At this point, you've extracted the details of the root certificate from the backend certificate. Azure Application Gateway health probe error with "Backend server You must be a registered user to add a comment. Service: application-gateway; GitHub Login: @vhorne; Microsoft Alias: absha; The text was updated successfully, but these errors were encountered: . If it's a self-signed certificate, you must generate a valid certificate and upload the root certificate to the Application Gateway HTTP settings. 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. Certificates signed by well known CA authorities whose CN matches the host name in the HTTP backend settings do not require any additional step for end to end TLS to work. Thanks! e. In the Inbound Rules section, add an inbound rule to allow destination port range 65503-65534 for v1 SKU or 65200-65535 v2 SKU with the Source set as GatewayManager service tag. Configuration details on Applicaiton Gateway: i am stuck with that issue, i am thinking maybe it can be a bug but can not be sure. How did you verify the cert? For File name, name the certificate file. Which ability is most related to insanity: Wisdom, Charisma, Constitution, or Intelligence? Which was the first Sci-Fi story to predict obnoxious "robo calls"? b. Now you may ask why it works when you browse the backend directly through browser. Failed health probe in Azure Application Gateway : r/AZURE - Reddit An authentication certificate is required to allow backend instances in Application Gateway v1 SKU. Application Gateway must be restarted after any modification to the backend server DNS entries to begin to use the new IP addresses. Is "I didn't think it was serious" usually a good defence against "duty to rescue"? On the Subnets tab of your virtual network, select the subnet where Application Gateway has been deployed. f. Select Save and verify that you can view the backend as Healthy. If you have an ExpressRoute/VPN connection to the virtual network over BGP, and if you're advertising a default route, you must make sure that the packet is routed back to the internet destination without modifying it. Sign in to the machine where your application is hosted. I guess you need a Default SITE binding to a certificate, without SNI ticked. Was the error "exactly" the same before you explicitly added the exported root rather than relying on "Digicert" as known authority? We should get one Linux machine which is in the same subnet/VNET of the backend application and run the following commands. You signed in with another tab or window. i had this issue for client and split multiple vms ! Backend Nginx works just fine with https, but the application gateway https health probes fail with the message "Backend server certificate is not whitelisted with Application Gateway." What is the deal here? Find out more about the Microsoft MVP Award Program. By clicking Sign up for GitHub, you agree to our terms of service and Parabolic, suborbital and ballistic trajectories all follow elliptic paths. This verification is Standard_v2 and WAF_v2 SKU (V2) behavior. An Azure service that provides a platform-managed, scalable, and highly available application delivery controller as a service. here is what happens in in Multiple chain certificate. 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. 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.. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Have a question about this project? Change). 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. Find centralized, trusted content and collaborate around the technologies you use most. 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. Required fields are marked *. Your email address will not be published. Our current setup includes app gateway v1 SKU integrated with app services having custom domain enabled. successfully, Application Gateway resumes forwarding the requests. Issue within certification chain using azure application gateway of the server certificate used by the backend does not match the trusted root certificate added to the application gateway. User without create permission can create a custom object from Managed package using Custom Rest API, the Allied commanders were appalled to learn that 300 glider troops had drowned at sea. Application Gateway WAF end to end SSL - Microsoft Community Hub To allow this access, upload trusted root certificates (for v2 SKU) of the back-end servers to the application gateway. Check whether the server is listening on the port that's configured. The probe requests for Application Gateway use the HTTP GET method. In this example, you'll use a TLS/SSL certificate for the backend certificate and export its public key to be used as . If it is, check the DNS server about why it can't resolve to the IP address of the specified FQDN. Sharing best practices for building any app with .NET. Azure Tip #5 Change Color Theme in Azure Portal, Azure Tip #1 Azure Services offered by Microsoft, Azure Tip #8 Fix Data for certificate is Invalid error, Azure Tip #6 Reset the Microsoft Azure Dashboard. Select the setting that has the expired certificate, select, The NSG on the Application Gateway subnet is blocking inbound access to ports 65503-65534 (v1 SKU) or 65200-65535 (v2 SKU) from Internet. 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. Unfortunately I have to use the v1 for this set-up. Check whether the backend server requires authentication. Otherwise, it will be marked as Unhealthy with this message. Asking for help, clarification, or responding to other answers. Change), You are commenting using your Facebook account. How do I bypass Microsoft account login in Windows11? Check whether your UDR has a default route (0.0.0.0/0) with the next hop not set as Internet: a. You'll see the Certificate Export Wizard. If you don't mind can you please post the summary of the root here to help people who might face similar issue. Traffic should still be routing through the Application Gateway without issue. Also, please let me know your ticket number so that I can track it internally. backend server, it waits for a response from the backend server for a configured period. 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. Version Independent ID: d85aa8fe-7270-d073-ea56-d1c0759383b8. In this example, you'll use a TLS/SSL certificate for the backend certificate and export its public key to be used as authentication certification. Configure that certificate on your backend server. During SSL negotiation , Client sends Client Hello and Server Responds with Server Hello with its Certificate to the Client. If there's a custom probe associated with the HTTP settings, SNI will be set from the host name mentioned in the custom probe configuration. We are in the 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." If the backend server response for the probe request contains the string unauthorized, it will be marked as Healthy. Thank you everyone. 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. The following steps help you export the .cer file for your certificate: Use the steps 1 - 8 mentioned in the previous section Export authentication certificate (for v1 SKU) to export the public key from your backend certificate. 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. If you see an Unhealthy or Degraded state, contact support. Cause: Application Gateway checks whether the host name specified in the backend HTTP settings matches that of the CN presented by the backend servers TLS/SSL certificate. Set the destination port as anything, and verify the connectivity. Were you able to reproduce this scenario and check? Message: Time taken by the backend to respond to application gateway's health probe is more than the timeout threshold in the probe setting. Azure Applicaiton Gateway V2 Certification Issue #62578 - Github Once the public key has been exported, open the file. Message: The root certificate of the server certificate used by the backend doesn't match the trusted root certificate added to the 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. certificate. here is the sample command you need to run, from the machine that can connect to the backend server/application. 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. Application Gateway doesn't provide you any mechanism to create or purchase a TLS/SSL certificate. Learn how your comment data is processed. Resolution: Check why the backend server or application isn't responding within the configured timeout period, and also check the application dependencies. 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. craigclouditpro your a lifesaver thanks for posting this friend ! Please upload a valid certificate, Azure Application Gateway - check health on subset of backend nodes, Certificate error Azure Application Gateway, Azure Application gateway health check certificate mismatch, Azure Application Gateway Backend Setting Certificate error - ApplicationGatewayTrustedRootCertificateInvalidData, Redirect traffic of Azure Application Gateway based on health probe. Most of the best practice documentation involves the V2 SKU and not the V1. b. Otherwise please share the message in that scenario without adding root explicitly. For example, you can configure Application Gateway to accept "unauthorized" as a string to match. Does a password policy with a restriction of repeated characters increase security? Please log in using one of these methods to post your comment: You are commenting using your WordPress.com account. @sajithvasu This lab takes quite a long time to set up! 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. Thanks. Sorry my bad, this is actually now working - I just needed to have the CN in the certificate match with what was set in backend pool. to your account. Have done s_client -connect backend_ip:443 -servername backend_url -showcerts and found that Root CA is missing. To check the health of your backend pool, you can use the This approach is useful in situations where the backend website needs authentication. 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. applications. @EmreMARTiN , you mentioned your backend certificate is from "Digicert" which is already a well-known trusted CA. 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. multiple chain certificate and if your backend application/server sends only the leaf the certificate , AppGW . A few things to check: a. If it's not, the certificate is considered invalid, and that will create a Solution: To resolve this issue, verify that the certificate on your server was created properly. Trusted root certificate is required to allow backend instances in application gateway v2 SKU. I will clean-up some of my older comments to keep it generic to all since the issue has been identified. 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. Check the backend server's health and whether the services are running. Passing negative parameters to a wolframscript. 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: <---> Access the backend server locally or from a client machine on the probe path, and check the response body. 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. 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. If they aren't, create a new rule to allow the connections. To Answer we need to understand what happens in any SSL/TLS negotiation. When i check health probe details are following: If Internet and private traffic are going through an Azure Firewall hosted in a secured Virtual hub (using Azure Virtual WAN Hub): a. The default probe request is sent in the format of
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