If you have properly added the certificate, and the backend pool is pointing to the custom domain (not the azurewebsites.net domain), then your best options are to either try the V2 SKU, or open a support request to troubleshoot further. By clicking Sign up for GitHub, you agree to our terms of service and Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. Change), You are commenting using your Facebook account. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. (These steps are for Windows clients.). The application is listeing in port 443. Asking for help, clarification, or responding to other answers. I had this same issue. If it is, check the DNS server about why it can't resolve to the IP address of the specified FQDN. How to organize your open apps in windows 11? If you don't mind can you please post the summary of the root here to help people who might face similar issue. 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. We initially faced an issue with the certificate on the backend server which has since been sorted out by MS Support. More info about Internet Explorer and Microsoft Edge, https://learn.microsoft.com/en-us/azure/application-gateway/application-gateway-backend-health-troubleshooting, https://learn.microsoft.com/en-us/azure/application-gateway/certificates-for-backend-authentication#export-trusted-root-certificate-for-v2-sku, https://learn.microsoft.com/en-us/azure/application-gateway/ssl-overview#end-to-end-tls-with-the-v2-sku. Or, if Pick hostname from backend HTTP settings is selected in the custom probe, SNI will be set from the host name mentioned in the HTTP settings. However, we need few details. https://docs.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 This approach is useful in situations where the backend website needs authentication. 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. I have some questions in regards to application gateway and need help with the same : 1)Is that application gateway can be configured with multiple backend pools and each pool can serve a request for different applications ? 566), Improving the copy in the close modal and post notices - 2023 edition, New blog post from our CEO Prashanth: Community is the future of AI. Microsoft Word Multiple Choice Questions & Answers, Excel Multiple Choice Questions & Answers, Different Ways to Change Power Button Action in Windows 11. Save the custom probe settings and check whether the backend health shows as Healthy now. Message: The root certificate of the server certificate used by the backend does not match the trusted root certificate added to the application gateway. 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 . Select No, do not export the private key, and then click Next. Check whether the backend server requires authentication. Applicaiton works fine on the backend servers with 443 certificate from Digicert. The root certificate is a Base-64 encoded X.509(.CER) format root certificate from the backend server certificates. 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. Your certificate is successfully exported. 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. Check that the backend responds on the port used for the probe. Ensure that you add the correct root certificate to whitelist the backend. c. Check the user-defined routes (UDR) settings of Application Gateway and the backend server's subnet for any routing anomalies. 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. A few things to check: a. But if the backend health for all the servers in a backend pool is unhealthy or unknown, you might encounter problems when you try to access Well occasionally send you account related emails. Do not edit this section. i have configured a Azure Application gateway (v2) and there is one backend servers. 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. 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. If you're aware of the application's behavior and it should respond only after the timeout value, increase the timeout value from the custom probe settings. Thanks in advance. Learn more about Application Gateway diagnostics and logging. 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. respond within the configured period (the timeout value), it's marked as Unhealthy until it starts responding within the configured timeout period again. By clicking Sign up for GitHub, you agree to our terms of service and Solution: To resolve this issue, verify that the certificate on your server was created properly. 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. Version Independent ID: <---> error. I will now proceed to close this github issue here since this repo is for MS Docs specifically. Open your Application Gateway HTTP settings in the portal. I am 3 backend pools . For example: Document Details For example, run the following command: Test-NetConnection -ComputerName www.bing.com -Port 443. Ensure that you add the correct root certificate to whitelist the backend". For new setup, we have noticed that app gateway back-end becomes unhealthy. Issue within certification chain using azure application gateway 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. 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. Thanks for this information. We are actually trying to simulate the Linux box as AppGW. Azure Tip #11 Get Reports of ARM Deployments in Your Subscription. 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. 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. PS : Dont forget to upload the CER file to the HTTP settings in ApplicationGateway before you do the Health Check. Solution: To resolve this issue, follow these steps: Learn more about Application Gateway probe matching. Configure that certificate on your backend server. If Application Gateway can't establish a TCP session on the port specified, the probe is marked as Unhealthy with this message. Expected:{HTTPStatusCode0} Received:{HTTPStatusCode1}. multiple chain certificate and if your backend application/server sends only the leaf the certificate , AppGW . 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. This verification is Standard_v2 and WAF_v2 SKU (V2) behavior. Change). It worked fine for me with the new setup in the month of September with V1 SKU. Otherwise, it will be marked as Unhealthy with this message. OpenSSL s_client -connect 10.0.0.4:443 -servername www.example.com -showcerts. Check whether the host name path is accessible on the backend server. Current date is not within the "Valid from" and "Valid to" date range on the certificate. Next hop: Internet. 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. Message: The backend health status could not be retrieved. To troubleshoot this issue, check the Details column on the Backend Health tab. "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. Error message shown - 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. For more information about how to extract and upload Trusted Root Certificates in Application Gateway, see Export trusted root certificate (for v2 SKU). with open ssl all looks okey i can see all chains. b. How to connect to new Wi-Fi in Windows 11? 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. 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. Check whether the server is listening on the port that's configured. rev2023.5.1.43405. b. to your account. Check the backend server's health and whether the services are running. Check whether the NSG settings of the Application Gateway subnet allow outbound public and private traffic, so that a connection can be made. This is the exact thing what we do when import .CER file in the HTTP Settings of 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. Verify that the FQDN entered in the backend pool is correct and that it's a public domain, then try to resolve it from your local machine. For information about how to configure a custom probe, see the documentation page. In 5e D&D and Grim Hollow, how does the Specter transformation affect a human PC in regards to the 'undead' characteristics and spells? Check to see if a UDR is configured. 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. d. Otherwise, change the next hop to Internet, select Save, and verify the backend health. here is the sample command you need to run, from the machine that can connect to the backend server/application. 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. By default, Azure Application Gateway probes backend servers to check their health status and to check whether they're ready to serve requests. If there's a custom DNS server configured on the virtual network, verify that the servers can resolve public domains. I have the same issue, Root cert is DigiCert. Azure Application Gateway health probe error with "Backend server To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Ensure that you add the correct root certificate to whitelist the backend. -> it has been taken from application servers by exporting as documented on Microsoft docs for WAF v2. 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. #please-close. Content Source:<---> Visual Studio Code How to Change Theme ? @EmreMARTiN you can run openssl from your local machine pointing to your backend, not external over WAF. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. In the Certificate properties, select the Details tab. "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. Or, you can use Azure PowerShell, CLI, or REST API. 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. OpenSSL s_client -connect 10.0.0.4:443 -servername www.example.com -showcerts. If thats not a desired value, you should create a custom probe and associate it with the HTTP settings. @EmreMARTiN , you mentioned your backend certificate is from "Digicert" which is already a well-known trusted CA. Change the host name or path parameter to an accessible value. See Configure end to end TLS by using Application Gateway with PowerShell. GitHub Login: <---> probe setting. Backend Health page on the Azure portal. Trusted root certificate mismatch If you can resolve it, restart Application Gateway and check again. I will wait for the outcome. For example, check for routes to network virtual appliances or default routes being advertised to the Application Gateway subnet via Azure ExpressRoute and/or VPN. You can add this to the application gateway to allow your backend servers for end to end TLS encryption. Make sure the UDR isn't directing the traffic away from the backend subnet. In Azure docs, it is clearly documented that you dont have import Auth certificate in HTTP settings of the backend if your backend application has Global trusted certificate. During SSL negotiation , Client sends "Client Hello" and Server Responds with "Server Hello" with its Certificate to the Client. 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. @einarasm read thru the responses from @krish-gh, specifically around leveraging OpenSSL toolkit to query the backend pool for the certificate trust chain, example: %> openssl s_client -connect 10.0.0.4:443 -servername www.example.com -showcerts. Let me set the scene. We have not faced any issues with HTTP sites but we are facing issues with end-to-end SSL. But if this message is displayed, it suggests that Application Gateway couldn't successfully resolve the IP address of the FQDN entered. 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. 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. Check the backend server's health and whether the services are running. Microsoft Alias: <--->. Access the backend server directly and check the time taken for the server to respond on that page. https://learn.microsoft.com/en-us/azure/application-gateway/ssl-overview#end-to-end-tls-with-the-v2-sku. The default probe request is sent in the format of ://127.0.0.1:. Message: Time taken by the backend to respond to application gateway's health probe is more than the timeout threshold in the probe setting. Which ability is most related to insanity: Wisdom, Charisma, Constitution, or Intelligence? Public domain name resolution might be required in scenarios where Application Gateway must reach out to external domains like OCSP servers or to check the certificates revocation status. If it's a self-signed certificate, you must generate a valid certificate and upload the root certificate to the Application Gateway HTTP settings. The Standard and WAF SKU (v1) Server Name Indication (SNI) is set as the FQDN in the backend pool address. I will let you know what I find. We should get one Linux machine which is in the same subnet/VNET of the backend application and run the following commands. This operation can be completed via Azure PowerShell or Azure CLI. ID: <---> As described earlier, the default probe will be to ://127.0.0.1:/, and it considers response status codes in the range 200 through 399 as Healthy. Sharing best practices for building any app with .NET. Set the destination port as anything, and verify the connectivity. privacy statement. Azure Application Gateway: 502 error due to backend certificate not In this article I am going to talk about one most common issue "backend certificate not whitelisted" 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. xcolor: How to get the complementary color. Now Clients will check the Server certificate and confirm if the certificate is issued by Trusted root or not. 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? To allow this access, upload trusted root certificates (for v2 SKU) of the back-end servers to the application gateway. with your vendor and update the server settings with the new b. Quickstart - Configure end-to-end SSL encryption with Azure Application Gateway - Azure portal, articles/application-gateway/end-to-end-ssl-portal.md, https://www.domstamand.com/end-to-end-ssl-solution-using-web-apps-and-azure-application-gateway-multisite-hosting/, https://learn.microsoft.com/en-us/azure/application-gateway/ssl-overview#for-probe-traffic, Version Independent ID: 948878b1-6224-e4c5-e65a-3009c4feda74. Required fields are marked *. Parabolic, suborbital and ballistic trajectories all follow elliptic paths. 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. Sign in to the machine where your application is hosted. This doesn't indicate an error. 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. Azure Application Gateway: 502 error due to backend certificate not Reference document: https://learn.microsoft.com/en-us/azure/application-gateway/ssl-overview#for-probe-traffic. If you do not have a support plan, please let me know. Already on GitHub? Cause: After Application Gateway sends an HTTP(S) probe request to the 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 , check the screenshot below, Now lets discuss what exactly is the confusion here if we have multiple Chain Cert, 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. Would you like to involve with it ? The certificate that has been uploaded to Application Gateway HTTP settings must match the root certificate of the backend server certificate. @sajithvasu This lab takes quite a long time to set up! 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. Application Gateway WAF end to end SSL - Microsoft Community Hub Check the document page that's provided in step 3a to learn more about how to create NSG rules. privacy statement. For File to Export, Browse to the location to which you want to export the certificate. If the domain is private or internal, try to resolve it from a VM in the same virtual network. Cause: When you create a custom probe, you can mark a backend server as Healthy by matching a string from the response body. If the backend server response for the probe request contains the string unauthorized, it will be marked as Healthy. Solution: If your TLS/SSL certificate has expired, renew the certificate Cause: Application Gateway resolves the DNS entries for the backend pool at time of startup and doesn't update them dynamically while running. 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. There is ROOT certificate on httpsettings. Something that you will see missing is microsft docs is having a default site binding to a SSL certificate without the SNI enabled. Configure that certificate on your backend server. When i check health probe details are following: Configure that certificate on your backend server. Now Clients will check the Server certificate and confirm if the certificate is issued by Trusted root or not. security issue in which Application Gateway marks the backend server as Unhealthy. The section in blue contains the information that is uploaded to application gateway. The issue was on certificate. On the Subnets tab of your virtual network, select the subnet where Application Gateway has been deployed. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Your email address will not be published. Can you post the output please after masking any sensitive info? From your TLS/SSL certificate, export the public key .cer file (not the private key). 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. Note that this .CER file must match the certificate (PFX) deployed at the backend application. @TravisCragg-MSFT : Did you find out anything? This can create problems when uploaded the text from this certificate to Azure. 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. -> Same certificate with private key from applicaton server. 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 -servername switch is used in shared hosting environments. An existing backend certificate is required to generate the authentication certificates or trusted root certificates required for allowing backend instances with Application Gateway. You must have a custom probe to change the timeout value.
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