For new setup, we have noticed that app gateway back-end becomes unhealthy. Search: Azure Application Gateway Backend Authentication Certificates. The following steps help you export the .cer file in Base-64 encoded X.509 (.CER) format for your certificate: To obtain a .cer file from the certificate, open Manage user certificates. Ensure that you add the correct root certificate to whitelist the backend " To use an existing domain name registrar, it must be delegated to the Azure DNS Zone. Mainly, you need to whitelist the APIM with Application Gateway, otherwise you will get the following error message in your designated probe: "Back-end server certificate is not whitelisted for an application gateway". Azure Application Gateway "502 Web Server" - Backend Certificate not whitelisted. The LDAP server uses the LDAP protocol to send an LDAP message to the other authorization service. When creating HTTPS setting backend-certificate is required in ". How do I fix the certificate issue? Enter certmgr.msc and select Enter. If you get stuck anywhere in the process, check out this simple guide on PHP-FPM settings. Make sure that the certificate on the StoreFront server is not expired. When a user request is received, the application gateway applies the configured rules to the request and routes it to a back-end pool instance. Cloud application view. Search: Azure Application Gateway Backend Authentication Certificates. In Application Gateway v1, if the application gateway does not receive a . By default, this interval is 20 seconds. Unless you are connecting to a large, unknown number of different servers over the lifetime of your application, it is suggested you use a single session for the lifetime of your application to benefit from connection pooling. On Azure you can use an Application Gateway for a variety of front-end services: Web application firewall (WAF) Load balancer. See Page 1. I Had uploaded latest certificate to the web site as well as on Azure (while creating the AppgatewayHttpSettings (crt file) and appGatewayHttpListener (pfx) file. Add the Authentication from the right-hand side of the page. To configure TLS termination, a TLS/SSL certificate must be added to the listener. The authentication certificate is the public key of backend server certificates in Base-64 encoded X.509(.CER) format. -> Same certificate with private key from applicaton server. I have two certificates on IIS right now. "Backend server certificate is not whitelisted with Application Gateway. It seems like something changed on the app gateway starting this month. Azure Application Gateway is a web traffic load balancer that enables you to manage traffic to your web applications. Select Win+R or right-click the Start button, and then select Run. 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. It means that /a/ on the Application Gateway is mapped to /a/ on the Web Server. Application Gateway continues to monitor the unhealthy instances and adds them back to the healthy back-end pool once they become available and respond to health . Using a Private CA Signed Certificate. Below you can find the architecture diagram used for this solution: The Azure Application Gateway has issues using SNI functionality in IIS (whitelisting the certificate). If the probe is indicating an issue, no traffic will actually be routed to the corresponding back-end, in that case, to the APIM. "Backend server certificate is not whitelisted with Application Gateway. It is required for docs.microsoft.com GitHub issue linking. There is certificate with private key as PFX on listenner settings. Error message shown - Backend server certificate is not whitelisted with Application Gateway. Traditional load balancers operate at the transport layer (OSI layer 4 - TCP and UDP) and route traffic based on source IP address and port, to a destination IP address and port. . Ensure that you add the correct root certificate to whitelist the backend Just check if your backend web server does not issue a single-level certificate. Backend server certificate invalid CA. Note: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. I currently have application gateway using the backend http port on the backend web server, so no cert is required, but it also means it's not end to end encryption. More Azure Application Gateway "502 Web Server" - Backend Certificate not whitelisted 2 Comments Azure Application Gateway "502 Web Server" - Backend Certificate not whitelisted Follow ME 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. Azure Application Gateway by default monitors the health of all resources in its back-end pool and automatically removes any resource considered unhealthy from the pool. The authentication certificate is the public key of backend server certificates in Base-64 encoded X.509(.CER) format. "Backend server certificate is not whitelisted with Application Gateway." Something that you will see missing is microsft docs is having a default site binding to a SSL certificate without the SNI enabled. Pricing SLAs Twitter. Application Gateway's backend health probe says Backend server certificate is not whitelisted with Application Gateway Only connections to known and allowed backends are then allowed. EDIT: Turned out I uploaded wrong pfx compared to the backend server. That's why this is a good method for applications that automatically request an IAM token. ; Architecture. Locate the certificate, typically in 'Certificates - Current User\Personal\Certificates', and right-click. Locate the certificate, typically in \Certificates - Current User\\Personal\\Certificates\, and open it. About Gateway Application Certificates Authentication Azure Backend cer file and stored in the backend authentication certificate list. All over 443. Application Gateway B. Certificate management - Certificates only need to be purchased and installed on the application gateway and not all backend servers. An important characteristic of URL-based routing is that requests are routed to back-end servers without alteration. If I wanted to use end to end encryption in application gateway, would the backend servers web server, such as nginx require the same certificate too? Azure Application Gateway "502 Web Server" - Backend Certificate not whitelisted Posted on April 5, 2019 by Craig I've 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 " Let me set the scene. The Azure App Registration is setup to support the OIDC Connect code flow with PKCE and uses a delegated access token for our backend. Click All Tasks, and then click Export. The current site with the SNI issue isn't healthy and resolves "Backend server certificate is not whitelisted with Application Gateway". ID: 77a317f1-deef-4ba7-5839-f39ce3733655 Only Relics will be able to view your data. Autoscale AKS pods with Application Gateway metrics 7. 5) Application Gateway v2 SKU up and running (Standard or WAF) - If you don't have an Application Gateway, you can follow the step-by-step guide and create one here. Select the root certificate and then select View Certificate. 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. -> it has been taken from application servers by exporting as documented on Microsoft docs for WAF v2. I initially thought it was my CER or PFX that was the issue . The module requires the app service to be x64 mode. You can also search for Certificate Manager on the Start menu. 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? Microsoft docs or via PowerShell: Microsoft docs This did resolve my issue and my health probes appeared as 'healthy' after changing these settings. In the Azure portal we go to the Data Box Gateway. It waits for a configurable interval of time for a response from the back-end instance. URL based/multi-site routing. It isn't mapped to /, which seems more intuitive as that would seem like the root of the 'a' web servers. There is ROOT certificate on httpsettings. certificate - (Optional) A list of client certificate thumbprints to present to the backend host. Cookie-based session affinity (Think: user -> HTTPS -> APPGW -> HTTP -> Backend) SSL offload, centralized SSL settings, HTTP-> HTTPS redirection. Youll need to upload the public cert of the . The Azure Application Gateway. AppGateway > HTTP settings > [Name of HTTP setting to change] > Uncheck Use Well Known CA Certificate > Upload CER file & set Override host name to my own custom host name. "Backend server certificate is not whitelisted with Application Gateway. The backend certificate can be the same as the TLS/SSL certificate or different for added security. 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. Your existing .CER file will be in the PKCS#7 file format and needs to be converted in to PKCS#10 file . You need a private (.pfx) certificate for your custom domain so you can upload it to the Application Gateway listeners. This is important. Document Details Do not edit this section. The IAM token has a short lifetime no more than 12 hours. About Certificates Azure Application Authentication Backend Gateway -1 Health probe of Application Gateway says "Backend server certificate is not whitelisted with Application Gateway.". The root certificate of the server certificate used by the backend does not match the trusted root certificate added to the application gateway. "Backend server certificate is not whitelisted with Application Gateway. Your existing .CER file will be in the PKCS#7 file format and needs to be converted in to PKCS#10 file . Azure Tip #9 - Application Gateway Backend Certificate not whitelisted Error developerpublish.com 4 CodersEditor 1 year ago in Cloud 0 Few days back , I had to update the Azure backend certificate for authentication in the Application Gateway and i started noticing this error Report Story Tags : Azure Thank you everyone. This saves both time and money. string "" no: custom_ippub_name: Name of the Public IP, generated if not. The certificate that has been uploaded to Application Gateway HTTP settings must match the root certificate of the backend server certificate.