Azure application gateway whitelist certificate Jun 27, 2024 · Prerequisites An existing backend certificate is required to generate the authentication certificates or trusted root certificates required for allowing backend instances with Application Gateway. The thumbprints must be an exact match. In that application gateway, I need to use one certificate in the backend setting. Each of these front-end … Dec 28, 2020 · Now to protect this application, I’m going to configure Web Application Firewall (WAF) with Azure Application Gateway S tep 1: Login into azure portal, Go to Azure Marketplace and search for Mar 8, 2024 · The required certificates are rootCA and interCA (intermediate certificate), to set in Server (rootCA. Dec 18, 2019 · 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. It takes about 15 minutes to propagate. In this article I am going to talk about one most common issue “backend certificate not whitelisted” Oct 9, 2025 · To do end to end TLS, Application Gateway requires the backend instances to be allowed by uploading authentication/trusted root certificates. Do not remove the existing one. Jul 23, 2020 · An Azure service that provides a platform-managed, scalable, and highly available application delivery controller as a service. There are two locations where certificates may exist: certificates stored in Azure Key Vault, or certificates uploaded to an application gateway. Jul 4, 2019 · I am setting, on Azure, an application gateway that I want to have an end to end SSL connection with my apache httpd server that servers my page from a vm I have set Listener and HTTP setting, it Jun 6, 2022 · I am trying to create a Backend Settings object during the Application Gateway using the portal interface. This certificate is already uploaded in the keyvault by my client. You will need to get the public part of root certificate used in backend server, and add it to the HTTP Setting that is associated with the backend pool. Ensure that you add the correct root certificate to whitelist the… Nov 25, 2024 · To configure certificate settings for the backend pool of Azure Application Gateway, you'll need to upload a trusted root certificate to the gateway. May 10, 2025 · Next, review the SSL configuration on the Application Gateway to confirm that OCSP stapling is properly enabled for mTLS. Sep 29, 2025 · The Application Gateway v2 SKU introduces the use of Trusted Root Certificates to allow TLS connections with the backend servers. Nov 5, 2024 · Listener TLS/SSL certificates in Application Gateway are used for terminating client TLS connection at the gateway. Jul 15, 2021 · This means API gateway cannot do TLS whitelist with the backend. com`. As part of this, it asks for the backend certificate. First Azure… Aug 31, 2025 · Intelligent routing – By decrypting the traffic, the application gateway has access to the request content, such as headers, URI, and so on, and can use this data to route requests. The root certificate is a Base-64 encoded X. In this blog, we'll walk through the steps to set up an Azure Application Gateway with a custom WAF policy to restrict access based on geographic regions and Arguments Reference The following arguments are supported: name - (Required) The name of the Application Gateway. pfx), Application Gateway Backend (rootCA. Nov 3, 2020 · The root certificate of the server certificate used by the backend does not match the trusted root certificate added to the application gateway. here is what happens in in Multiple chain certificate. In this article, you learn how to: Export authentication certificate from a backend certificate (for v1 SKU Dec 6, 2018 · Application Gateway will only communicate with backends whose Server certificate’s root certificate matches one of the list of trusted root certificates in the backend http setting associated with the pool. Aug 31, 2022 · Lets resolve that For Application Gateway v2 SKU, the root certificate requires to be Base-64 encoded X. After you have an App Service certificate, you can then import it into an App Service app. In each case, if the backend server doesn't respond successfully, Application Gateway marks the server as Unhealthy and Oct 6, 2025 · Azure Application Gateway allows you to have an App Service app or other multitenant service as a backend pool member. The SSL certificate can be configured to Application Gateway either from a local PFX certificate file or a reference to a Azure Key Vault unversioned secret Id. Apr 6, 2020 · Using Azure Application Gateway with API Management service An application developed using a microservices architecture might expose multiple front-end services to clients. ” Something that you will see missing is microsft docs is having a default site binding to a SSL certificate without the SNI enabled. Changing this forces a new resource to be created. In this article I am going to talk about one most common issue "backend certificate not whitelisted" If you check the 本文通过示例演示如何将 TLS/SSL 证书转换为允许 Azure 应用程序网关中的后端实例所需的身份验证证书和受信任根证书 Nov 4, 2024 · Prerequisites You’ll need the following in-place already. This provision removes the use of authentication certificates (individual Leaf certificates) that were required in the v1 SKU. When you want to reach your application over HTTPS you need to upload a TLS Mar 30, 2022 · 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 Apr 30, 2025 · Backend Health Status: Unhealthy Message: The root certificate of the server certificate used by the backend does not match the trusted root certificate added to the application gateway. pfx) respectively. In this case, you would add the public cert of the app service into the backend whitelist of the app gateway. We want to set up an end to end SSL connection between the Application Gateway and the web app. Dec 16, 2021 · 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. Now I want to limit access to some web apps with IP through Azure Application Gateway or Azure Firewall. However when I replace all the 3 certificate Jul 22, 2025 · By default, Azure Application Gateway probes backend servers to check their health status and to check whether they're ready to serve requests. Apr 30, 2025 · Backend Health Status: Unhealthy Message: The root certificate of the server certificate used by the backend does not match the trusted root certificate added to the application gateway. Nov 5, 2024 · Backend certificate is required to generate the authentication certificates required for allowing backend instances with Application Gateway. For an HTTPS listener for either V1 or V2, yes you need a PFX. Ensure that you add the correct root certificate to whitelist the… Dec 3, 2019 · However, I am trying to use a set of custom certificates (a CA and a signed SSL cert) that I have generated and initially, I was getting issues as the health probes were all failing with the message The root certificate of the server certificate used by the backend does not match the trusted root certificate added to the application gateway. Jul 21, 2025 · This article provides a comprehensive guide for using App Service Certificates in Application Gateway, including usage steps, restrictions, and best practices. For the v1 SKU, authentication certificates are required, but for the v2 SKU trusted root certificates are required to allow the certificates. Mar 29, 2022 · Are you looking to configure end-to-end TLS to a backend web server that hosts multiple sites with a wildcard certificate? This blog provides a walkthrough. location - (Required) The Azure region where the Application May 18, 2024 · Learn how to generate an Azure Application Gateway self-signed certificate with a custom root CA Certificates required to allow backend servers - Azure Application Gateway This article shows how to add and manage TLS/SSL certificates in Azure App Service to secure your custom domain. So after setting up everything including The root certificate of the server certificate used by the backend does not match the trusted root certificate added to the application gateway. Please upload a valid certificate. 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. CER) format. Then you would update the cert binding on your app service with your Application Gateway only communicates with those backend servers that have either allow-listed their certificate with the Application Gateway or whose certificates are signed by well-known CA authorities and the certificate's CN matches the host name in the HTTP backend settings. These app services are behind an Application Gateway which has the same certificate bound to the listener for this URL so the flow currently is: Browser to AG over HTTPS > Gateway to App Services over HTTPS > App Service to Gateway over HTTPS > Gateway to Browser over HTTPS. You can add more than one certificate to cover all servers in the pool Apr 1, 2024 · Application gateway allows you to have an App Service app as a backend pool member with a custom domain. The gateway then applies the routing rules to the traffic, re-encrypts the packet, and forwards the packet to the appropriate backend server based on the routing rules defined. Ensure that you add the correct root certificate to whitelist the backend. bar. I obtained this by using Windows and certmgr, navigating to the required certificate -> double-click and navigate to the certificate path tab – as below, you will see the full certificate path. It identifies the root Jan 17, 2025 · Problem in the Azure portal If you are publishing your applications publicly, you are probably protecting them with a Web Application Firewall (WAF). “Backend server certificate is not whitelisted with Application Gateway. Oct 6, 2025 · In this tutorial, you learn how to create URL path-based routing rules for an application gateway and virtual machine scale set using the Azure portal. In this article, you learn how to: Export authentication certificate from a backend certificate (for v1 SKU Feb 22, 2019 · Azure: Upload whitelist certificate to application gateway Asked 6 years, 5 months ago Modified 6 years, 5 months ago Viewed 259 times Jul 8, 2025 · Listener TLS/SSL certificates in Application Gateway are used for terminating client TLS connection at the gateway. Making sure your App Gateway has the authenticated cert installed on the HTTPs backend settings Jun 27, 2024 · Prerequisites An existing backend certificate is required to generate the authentication certificates or trusted root certificates required for allowing backend instances with Application Gateway. Jan 17, 2025 · Problem in the Azure portal If you are publishing your applications publicly, you are probably protecting them with a Web Application Firewall (WAF). 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. Missing intermediate CA certificates or misconfigured trust chains can also lead to OCSP failures, so validate the certificate chain of the client certificates. This article shows you how to create an Azure App Service certificate and perform management tasks like renewing, synchronizing, and deleting certificates. The backend certificate was issued Mar 1, 2022 · I created Self Signed certificates for this private DNS zone0. Application Gateway terminates the TLS/SSL connection at the application gateway. cer) and Azure Firewall (interCA. We had to switch to non-SSL port for our backend servers to make the problem go away. resource_group_name - (Required) The name of the resource group in which to the Application Gateway should exist. Apr 1, 2022 · 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. May 28, 2023 · Here is the issue we face though: We have our web apps parked behind a load balancer such as Azure Application Gateway. Certificate management – Certificates only need to be purchased and installed on the application gateway and not all backend servers. This saves both time and Jul 8, 2025 · Overview Azure Application Gateway supports end-to-end encryption of traffic. Apr 5, 2019 · So, I created a default site pointed it to wwwroot, and selected one of my already installed certificates (you can probably PowerShell an SSL for this tbh, but I chose to re-use an already existing one) you don’t have to supply a hostname, just a dummy site with an authenticated cert on port 443. By understanding the limitations and using the Azure Key Vault service effectively, you can build a robust certificate management workflow across both App Services and Application Gateway. An App Service certificate is a private certificate that Azure manages. May 5, 2023 · Resolving the "Data for certificate is invalid" error when configuring end-to-end TLS with Azure Application Gateway V2. In this article, you learn to configure an App Service app with Application Gateway. cer of the LEAF certificate that the backend server presents. This must be a . Ingress annotations are applied to all HTTP settings, backend pools, and listeners derived from an ingress resource. Now, the same certificate is applied on application gateway and on the backend pool servers/VMs. We will Generate the frontend and the backend certificates Deploy a simple application with HTTPS Upload the backend certificate's root certificate to Application Gateway Setup ingress for E2E Note: Following tutorial makes use of test certificate generated using OpenSSL. An existing Azure Storage Account A custom domain (and SSL certificate) ready to use You must be registered to use the preview basic-tier Application Gateway – Deploy Application Gateway Basic (Preview) – Azure Application Gateway | Microsoft Learn Step 1 – Create the Application Gateway Here’s how to configure the Application May 23, 2025 · Application Gateway Ingress Controller (AGIC) relies on annotations to program Azure Application Gateway features that aren't configurable via the ingress YAML. You can register listeners on this application gateway which will redirect traffic to the backend web apps we specify and we can pick which SSL certificate we want the listener to use. One effective way to enhance your application's security is by configuring an Azure Application Gateway with a Web Application Firewall (WAF) policy. The certificate that has been uploaded to Application Gateway HTTP settings must match the root certificate of the backend server certificate. CER) format root certificate from the backend certificate server. When you want to reach your application over HTTPS you need to upload a TLS Azure PowerShell 或者，可以使用 Azure CLI 或 Azure PowerShell 上传根证书。 以下代码是一个 Azure PowerShell 示例。 Nov 23, 2023 · Application Gateway will only communicate with backends whose server certificate’s root certificate matches one of the list of trusted root certificates in the backend http setting associated with the pool. Lets say the certificate is for `foo-test. Feb 10, 2023 · Based on this document, I used Azure Application Gateway (WAF) before Azure Firewall. This certificate is used to establish trust with your backend servers. Jun 27, 2024 · To do end to end TLS, Application Gateway requires the backend instances to be allowed by uploading authentication/trusted root certificates. In most cases I deploy an Application Gateway and attache a Web Application Firewall Policy to it to protect the applications that I want to publish to the internet. Currently these have a custom domain with a wildcard cert bound to it. Mar 3, 2023 · 1 I have a webapp hosted in Azure app service and has a certificate associated with its domain and the certificate is stored in the keyvault. For some specific reasons, we have to use a company self-signed certifcate. You can use App Service Certificate or a Mar 30, 2022 · This post has been republished via RSS; it originally appeared at: New blog articles in Microsoft Tech Community. Also, I have three backend pools (Web Apps). No CA and no chain. 509 (. If you're operating in enterprise on an ASE, you'll likely have an app service on a custom domain with a cert issued by a custom internal CA. I want to create one application gateway with web application firewall (WAF v2 tier). This function is analogous to uploading a certificate on a web server to support TLS/HTTPS connections from clients/browsers. Oct 22, 2017 · End to End SSL with Application Gateway and Azure Web Apps (10/2017) Mar 31, 2025 · When you renew an SSL certificate with a valid new certificate, this doesn't incur any downtime for the service. Mar 31, 2022 · 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. These certificates are only for illustration and should be used in May 28, 2024 · In today's digital landscape, ensuring the security of web applications is paramount. Uploaded the root certificate to the certificates tabs under security, as well as under the HTTP (s) settings tab of the application gateway. however my custom healt probe and health check keep mentioning that the CN Name does not match that one of the backend. The backend certificate can be the same as the TLS/SSL certificate or different for added security. This isn't that fun because every year when you rotate Nov 24, 2022 · The root certificate of the server certificated used by the backend does not match the trusted root certificate added to the application gateway. Ensure that you add the correct root certificate to whitelist the backend Jun 1, 2020 · Backend server certificate expired. The configuration for Application Gateway differs depending on how App Service can be accessed: The first option makes use of a custom domain on both Application Gateway and the App Service in Hello everyone I have a Drupal web app hosted on a VM in Azure. But V1 and V2 have different requirements for the backend TLS connection: V1 requires that you whitelist the backend server's certificates. keluna ehxcj insad dsf jfur sdut gcqmetq srpgz qkhyts fvozq roqbk sanole jruzv kugeg glpug