backend server certificate is not whitelisted with application gateway

To check the health of your backend pool, you can use the b. Open a command prompt (Win+R -> cmd), enter netstat, and select Enter. "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. 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. 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. Follow steps 1-10 in the preceding section to upload the correct trusted root certificate to Application Gateway. The Standard and WAF SKU (v1) Server Name Indication (SNI) is set as the FQDN in the backend pool address. I am having the same issue with App GW v1 in front of an API Management. If you have an ExpressRoute/VPN connection to the virtual network over BGP, and if you're advertising a default route, you must make sure that the packet is routed back to the internet destination without modifying it. 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. 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. For example: 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. You can use any tool to access the backend server, including a browser using developer tools. Azure Application Gateway: 502 error due to backend certificate not whitelisted in the AppGW, Troubleshoot backend health issues in Azure Application Gateway | Microsoft Docs. For File to Export, Browse to the location to which you want to export the certificate. The default probe request is sent in the format of ://127.0.0.1:. To troubleshoot this issue, check the Details column on the Backend Health tab. This is the exact thing what we do when import .CER file in the HTTP Settings of the Application Gateway. Well occasionally send you account related emails. b. Resolution: Check why the backend server or application isn't responding within the configured timeout period, and also check the application dependencies. Ensure that you add the correct root certificate to whitelist the backend. This is the exact thing what we do when import .CER file in the HTTP Settings of the Application Gateway. If the port mentioned is not the desired port, enter the correct port number for Application Gateway to connect to the backend server. In the Certificate properties, select the Details tab. 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. The certificate that has been uploaded to Application Gateway HTTP settings must match the root certificate of the backend server certificate. i.e. 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. If the server returns any other status code, it will be marked as Unhealthy with this message. c. Check whether any NSG is configured. OpenSSL s_client -connect 10.0.0.4:443 -servername www.example.com -showcerts. To Answer we need to understand what happens in any SSL/TLS negotiation. Also, in this example, you'll use the Windows Certificate Manager tool to export the required certificates. I am currently experimenting with different ways to add the backend pools and heath probes to find a working configuration. @TravisCragg-MSFT: Thanks for checking this. Thank you everyone. 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. If it's a self-signed certificate, you must generate a valid certificate and upload the root certificate to the Application Gateway HTTP settings. Let me set the scene. Version Independent ID: d85aa8fe-7270-d073-ea56-d1c0759383b8. @TravisCragg-MSFT : Did you find out anything? Cause: This error occurs when Application Gateway can't verify the validity of the certificate. I will post any updates here as soon as I have them. @EmreMARTiN you can run openssl from your local machine pointing to your backend, not external over WAF. 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. 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 . Open your Application Gateway HTTP settings in the portal. 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. To create a custom probe, follow these steps. Thanks. Does a password policy with a restriction of repeated characters increase security? Azure Application Gateway: 502 error due to backend certificate not You should see the root certificate details. i raised ticket to Microsoft. When i check health probe details are following: Can you please add reference to relevant Microsoft Docs page you are following? 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. It is required for docs.microsoft.com GitHub issue linking. 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. here is what happens in in Multiple chain certificate. -Verify return code: 19 (self signed certificate in certificate chain). https://docs.microsoft.com/en-us/azure/application-gateway/application-gateway-end-to-end-ssl-powershell, Azure Cyber Security: Protect & Secure Your Cloud Infrastructure, Send Text & WhatsApp Messages for Azure VM Status with Azure Automation, Migrate SOAR Use Cases from Splunk to Microsoft Sentinel, Azure Defender and Azure Sentinel Alerts Bi-Directional Sync. Did the drapes in old theatres actually say "ASBESTOS" on them? @krish-gh actually it was actually what have i tried firstly but sitouiotion was same. 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. 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. @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. In the v2 SKU, if there's a default probe (no custom probe has been configured and associated), SNI will be set from the host name mentioned in the HTTP settings. Check whether your server allows this method. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Design a site like this with WordPress.com, Troubleshoot backend health issues in Azure Application Gateway | Microsoft Docs. A pfx certificate has also been added. During SSL negotiation , Client sends Client Hello and Server Responds with Server Hello with its Certificate to the Client. If you're using Azure default DNS, check with your domain name registrar about whether proper A record or CNAME record mapping has been completed. Ive deployed 2 Virtual Machines in North Europe (Across Zones 1 and 2) both configured with IIS with 6 sites with different URLs (all with Server Name Indication ticked) installed all the certificates to match their names as-well. For the v1 SKU, authentication certificates are required, but for the v2 SKU trusted root certificates are required to allow the certificates. Certificates signed by well known CA authorities whose CN matches the host name in the HTTP backend settings do not require any additional step for end to end TLS to work. Below is what happens during SSL negotiation when you have single chain cert and root in the AppGW. The backend certificate can be the same as the TLS/SSL certificate or different for added security. Horizontal and vertical centering in xltabular, one or more moons orbitting around a double planet system, Embedded hyperlinks in a thesis or research paper, Proving that Every Quadratic Form With Only Cross Product Terms is Indefinite. d. If an NSG is configured, search for that NSG resource on the Search tab or under All resources. Only HTTP status codes of 200 through 399 are considered healthy. Open the Application Gateway HTTP Settings page in the Azure portal. 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. Default route advertised by the ExpressRoute/VPN connection to the virtual network over BGP: a. Ensure that you add the correct root certificate to allowlist the backend. If there's a custom DNS server configured on the virtual network, verify that the servers can resolve public domains. Was the error "exactly" the same before you explicitly added the exported root rather than relying on "Digicert" as known authority? Sorry my bad, this is actually now working - I just needed to have the CN in the certificate match with what was set in backend pool. "The root certificate of the server certificate used by the backend does not match the trusted root certificate added to the application gateway". However, we need few details. 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. Now Clients will check the Server certificate and confirm if the certificate is issued by Trusted root or not. Check the backend server's health and whether the services are running. Parabolic, suborbital and ballistic trajectories all follow elliptic paths. Error message shown - Backend server certificate is not whitelisted with Application Gateway. Configure that certificate on your backend server. Azure Application Gateway: 502 error due to backend certificate not It worked fine for me with the new setup in the month of September with V1 SKU. Adding the certificate ensures that the application gateway communicates only with known back-end instances. Few days back , I had to update the Azure backend certificate for authentication in the Application Gateway and i started noticing this error, Backend server certificate is not whitelisted with Application Gateway.. d. Otherwise, change the next hop to Internet, select Save, and verify the backend health. When I use v2 SKU with the option to trust the backend certificate from APIM it works. 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. I have tried to upload root CA instead of using well-known CA and the issue persist. More info about Internet Explorer and Microsoft Edge, Export authentication certificate (for v1 SKU), Configure end to end TLS by using Application Gateway with PowerShell, Export authentication certificate from a backend certificate (for v1 SKU), Export trusted root certificate from a backend certificate (for v2 SKU), To obtain a .cer file from the certificate, open. probe setting. If they aren't, create a new rule to allow the connections. -verify error:num=19:self signed certificate in certificate chain 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. #please-close. Export trusted root certificate (for v2 SKU): This causes SSL/TLS negoatiation failure and AppGW marks the backend as unhealthy because it is not able to initiate the probe. Just FYI. -> Same certificate with private key from applicaton server. 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. Required fields are marked *. The probe requests for Application Gateway use the HTTP GET method. Current date is not within the "Valid from" and "Valid to" date range on the certificate. I am opening a PR to update the End-to-End Howto guide with a description of the error and a link to the SSL overview. Trusted root certificate is required to allow backend instances in application gateway v2 SKU. Fast-forward 2022, we are also faced with the same issue and getting the same error "Backend server certificate is not whitelisted with Application Gateway" using Application Gateway v1. Select the root certificate and then select View Certificate. Hi @TravisCragg-MSFT : Were you able to check this? 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. When we check the certificate with the openssl there were following errors: In this example, requests using TLS1.2 are routed to backend servers in Pool1 using end to end TLS. An authentication certificate is required to allow backend instances in Application Gateway v1 SKU.

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