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. You should do this only if the backend has cert which is issued by internal CA, I hope we are clear till now on why we import Authenticate cert in the HTTP settings of the AppGW and when we use the option "Use Well Known CA", But the actual problem arises if you are using a Third party Cert or Internal CA Cert which has Intermediate CA and then Leaf certificate, Most of the orgs for security reasons use Root Cert----> Intermediate Cert ------> Leaf Cert , even Microsoft follows the same for bing , you can check yourself as below, Now lets discuss what exactly is the confusion here if we have multiple Chain Cert, Check this below when you have single chain certificate , then there will be no confusion with appgw , if your root CA is Global trusted just select "Use Trusted Root CA" option in HTTPsettings, If you root CA is Internal CA , then import that Top root cert in .cer format and upload it in the HTTP settings. To find out the reason, check OpenSSL diagnostics for the message associated with error code {errorCode}. Content: <---> Azure Tip #7 What are the Storage Tiers in Azure ? AppGW is a PaaS instance , by default you wont get access to the Applicaiton Gateway. Now how can find if my application sending the complete chain , the easy way to find is running openssl from either windows client or Linux client which is present in the same network/subnet of the backend application. @TravisCragg-MSFT : Did you find out anything? This can create problems when uploaded the text from this certificate to Azure. Or, you can use Azure PowerShell, CLI, or REST API. Select the root certificate and then select View Certificate. We initially faced an issue with the certificate on the backend server which has since been sorted out by MS Support. The text was updated successfully, but these errors were encountered: @sajithvasu I am not aware of any changes that have been made on the App Gateway side that would make this not work. 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. The current data must be within the valid from and valid to range. To Answer we need to understand what happens in any SSL/TLS negotiation. If you see an Unhealthy or Degraded state, contact support. New blog articles in Microsoft Tech Community, Troubleshoot backend health issues in Azure Application Gateway | Microsoft Docs, Set up Granular Delegated Admin Privileges in Microsoft 365 Lighthouse, Data Mapper Patterns: Conditional Mapping, Windows Server Summit 2022: Modernize your Apps with Windows Containers and AKS, Kubernetes External DNS for Azure DNS & AKS, Update: Addressing Karis Law and Ray Baums Act with Microsoft Teams phone system, SSIS Always on AG (Availability Group) and Error Please Create a Master Key, Azure Marketplace new offers January 4, 2023. Verify that the response body in the Application Gateway custom probe configuration matches what's configured. 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. You can find more details about this issue in our Azure docs, there is a solution already documented inTroubleshoot backend health issues in Azure Application Gateway | Microsoft Docs , Look for the sub topic "Trusted root certificate mismatch", Your email address will not be published. Your certificate is successfully exported. @EmreMARTiN , you mentioned your backend certificate is from "Digicert" which is already a well-known trusted CA. Already on GitHub? If you can resolve it, restart Application Gateway and check again. 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 The chain looks ok to me. Make sure https probe is configured correctly as well. Do not edit this section. 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. 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. Trusted root certificate mismatch privacy statement. Message: The backend health status could not be retrieved. I will post the root cause summary once there is an outcome from your open support case. This usually happens when the FQDN of the backend has not been entered correctly.. For example, http://127.0.0.1:80 for an HTTP probe on port 80. Check whether the NSG settings of the Application Gateway subnet allow outbound public and private traffic, so that a connection can be made. 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. 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 am 3 backend pools . Internal server error. 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. Required fields are marked *. @TravisCragg-MSFT: Thanks for checking this. here is the sample command you need to run, from the machine that can connect to the backend server/application. 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. To ensure the application gateway can send traffic to the backend pool via an Azure Firewall in the Virtual WAN hub, configure the following user defined route: Address Prefix: Backend pool subnet For example: Sure I would be glad to get involved if needed. Connect and share knowledge within a single location that is structured and easy to search. I will clean-up some of my older comments to keep it generic to all since the issue has been identified. 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. I had this same issue. 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. For new setup, we have noticed that app gateway back-end becomes unhealthy.
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