Configure that certificate on your backend server. This article describes the symptoms, cause, and resolution for each of the errors shown. I will post any updates here as soon as I have them. 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. Verify that the response body in the Application Gateway custom probe configuration matches what's configured. If they don't match, change the probe configuration so that it has the correct string value to accept. Cause: Application Gateway resolves the DNS entries for the backend pool at time of startup and doesn't update them dynamically while running. For File to Export, Browse to the location to which you want to export the certificate. 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Gateway | Microsoft Docs , Look for the sub topic "Trusted root certificate mismatch", Your email address will not be published. @TravisCragg-MSFT: Thanks for checking this. A pfx certificate has also been added. 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. 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. Message: The Common Name (CN) of the backend certificate doesn't match the host header of the probe. In this example, requests using TLS1.2 are routed to backend servers in Pool1 using end to end TLS. We initially faced an issue with the certificate on the backend server which has since been sorted out by MS Support. We should get one Linux machine which is in the same subnet/VNET of the backend application and run the following commands. with your vendor and update the server settings with the new Alternatively, you can do that through PowerShell/CLI. We have private key .pfx issued by CA uploaded to app services and its public certificate .cer file uploaded to app gateway backend authentication as mentioned in this document. Not the answer you're looking for? 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. This is the exact thing what we do when import .CER file in the HTTP Settings of the Application Gateway. Change the host name or path parameter to an accessible value. There is ROOT certificate on httpsettings. 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. 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. You signed in with another tab or window. Check whether the virtual network is configured with a custom DNS server. The section in blue contains the information that is uploaded to application gateway. For the v1 SKU, authentication certificates are required, but for the v2 SKU trusted root certificates are required to allow the certificates. I did not find this error message listed here https://learn.microsoft.com/en-us/azure/application-gateway/application-gateway-backend-health-troubleshooting. 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. Well occasionally send you account related emails. 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. This is the exact thing what we do when import .CER file in the HTTP Settings of the Application Gateway. 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. Content: <---> Additionally, if you want to use a different text editor, understand that some editors can introduce unintended formatting in the background. I am having the same issue with App GW v1 in front of an API Management. The chain looks ok to me. Check the backend server's health and whether the services are running. To increase the timeout value, follow these steps: Message: Application Gateway could not create a probe for this backend. To learn more, see our tips on writing great answers. To troubleshoot this issue, check the Details column on the Backend Health tab. The text was updated successfully, but these errors were encountered: @EmreMARTiN, Thanks for the feedback. Now Clients will check the Server certificate and confirm if the certificate is issued by Trusted root or not. i had this issue for client and split multiple vms ! Message: The root certificate of the server certificate used by the backend doesn't match the trusted root certificate added to the application gateway. Message: Status code of the backend's HTTP response did not match the probe setting. By clicking Sign up for GitHub, you agree to our terms of service and 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. Cause: After the DNS resolution phase, Application Gateway tries to connect to the backend server on the TCP port that's configured in the HTTP settings. 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. Follow steps 1a and 1b to determine your subnet. OpenSSL> s_client -connect 10.0.0.4:443 -servername www.example.com -showcerts 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 . @sajithvasu I would continue to work with the support engineers while they look deeper into your authentication certificate. Now you may ask why it works when you browse the backend directly through browser. Document Details Sign in When I use v2 SKU with the option to trust the backend certificate from APIM it works. 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. Best practices and the latest news on Microsoft FastTrack, The employee experience platform to help people thrive at work, Expand your Azure partner-to-partner network, Bringing IT Pros together through In-Person & Virtual events. The default route is advertised by an ExpressRoute/VPN connection to a virtual network over BGP. Making sure your App Gateway has the authenticated cert installed on the HTTPs backend settings, with the appropriate Rules & Probe setup and bobs your uncle, I got full Health back, and all my sites were live and kicking. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. For example, you can use OpenSSL to verify the certificate and its properties and then try reuploading the certificate to the Application Gateway HTTP settings. If your certificate is working on browser directly hitting the app and not with AppGW then what is the exact problem? 10.0.0.4 = IP of backend server (if using DNS ensure it points to backend server and not the public IP of appgw). Unfortunately I have to use the v1 for this set-up. Message: The server certificate used by the backend is not signed by a well-known Certificate Authority (CA). The default probe request is sent in the format of ://127.0.0.1:. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. 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. Traffic should still be routing through the Application Gateway without issue. On the Export File Format page, select Base-64 encoded X.509 (.CER)., and then click Next. By default, Azure Application Gateway probes backend servers to check their health status and to check whether they're ready to serve requests. In this article I am going to talk about one most common issue "backend certificate not whitelisted" Applicaiton works fine on the backend servers with 443 certificate from Digicert. d. Otherwise, change the next hop to Internet, select Save, and verify the backend health. 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 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. On the Subnets tab of your virtual network, select the subnet where Application Gateway has been deployed. What are the advantages of running a power tool on 240 V vs 120 V? 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 . To subscribe to this RSS feed, copy and paste this URL into your RSS reader. 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? This month for new environment build we started encountering this problem. with open ssl i should run the command on from local server ? Let me set the scene. The Standard and WAF SKU (v1) Server Name Indication (SNI) is set as the FQDN in the backend pool address. 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. c. If the next hop is virtual network gateway, there might be a default route advertised over ExpressRoute or VPN. 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. Export trusted root certificate (for v2 SKU): Message: Application Gateway could not connect to the backend. If they aren't, create a new rule to allow the connections. Open your Application Gateway HTTP settings in the portal. Select the root certificate and then select, In the Certificate properties, select the, Verify the CN of the certificate from the details and enter the same in the host name field of the custom probe or in the HTTP settings (if. You signed in with another tab or window. This operation can be completed via Azure PowerShell or Azure CLI. Now how do we find if my application/backendserver is sending the complete chain to AppGW? Check whether your server allows this method. Alternatively, you can export the root certificate from a client machine by directly accessing the server (bypassing Application Gateway) through browser and exporting the root certificate from the browser. The intermediate certificate(s) should be bundled with server certificate and installed on the backend server. Hi @TravisCragg-MSFT : Were you able to check this? 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. Solution: If you receive this error message, there's a mismatch between the certificate that has been uploaded to Application Gateway and the one that was uploaded to the backend server. probe setting. Select the root certificate and then select View Certificate. How to Restart Windows Explorer Process in Windows 11? Your email address will not be published. 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. 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. 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. 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. Visual Studio Code How to Change Theme ? 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. "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. 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. backend server, it waits for a response from the backend server for a configured period. Because the probe requests don't carry any user credentials, they will fail, and an HTTP 401 status code will be returned by the backend server. Connect and share knowledge within a single location that is structured and easy to search. Check the backend server's health and whether the services are running. How did you verify the cert? On the Details tab, select the Copy to File option and save the file in the Base-64 encoded X.509 (.CER) format. Only HTTP status codes of 200 through 399 are considered healthy. 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. . Next hop: Azure Firewall private IP address. 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. For more information about how to extract and upload Trusted Root Certificates in Application Gateway, see Export trusted root certificate (for v2 SKU). Passing negative parameters to a wolframscript. An authentication certificate is required to allow backend instances in Application Gateway v1 SKU. Current date is not within the "Valid from" and "Valid to" date range on the certificate. Configure that certificate on your backend server. 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. -> it has been taken from application servers by exporting as documented on Microsoft docs for WAF v2. Message: The backend health status could not be retrieved. In that case, I suggest you to create an Azure Support ticket to take a closer look at internal diagnostics of your app gateway instance considering it's still occurring after troubleshooting. Ensure that you add the correct root certificate to whitelist the backend". Your certificate is successfully exported. Create a free website or blog at WordPress.com. (Ep. thank you for sharing it . By clicking Sign up for GitHub, you agree to our terms of service and The gateway listener is configured to accept HTTPS connections. Failing endpoint is missing root CA as working one has it. 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. or from external over WAF ? However, we need few details. @EmreMARTiN you can run openssl from your local machine pointing to your backend, not external over WAF. Your email address will not be published. For File name, name the certificate file. Version Independent ID: d85aa8fe-7270-d073-ea56-d1c0759383b8. For more information on SNI behavior and differences between v1 and v2 SKU, see Overview of TLS termination and end to end TLS with Application Gateway. To ensure the application gateway can send traffic directly to the Internet, configure the following user defined route: Address prefix: 0.0.0.0/0 Configure that certificate on your backend server. Thanks for contributing an answer to Stack Overflow! I am currently experimenting with different ways to add the backend pools and heath probes to find a working configuration. Backend Health page on the Azure portal. To Answer we need to understand what happens in any SSL/TLS negotiation. For new setup, we have noticed that app gateway back-end becomes unhealthy. We have not faced any issues with HTTP sites but we are facing issues with end-to-end SSL. Message: Backend certificate is invalid. 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. It worked fine for me with the new setup in the month of September with V1 SKU. An existing backend certificate is required to generate the authentication certificates or trusted root certificates required for allowing backend instances with Application Gateway.
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