backend server certificate is not whitelisted with application gateway

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. -> it has been taken from application servers by exporting as documented on Microsoft docs for WAF v2. To find out the reason, check OpenSSL diagnostics for the message associated with error code {errorCode}. Make sure https probe is configured correctly as well. The custom DNS server is configured on a virtual network that can't resolve public domain names. Check the document page that's provided in step 3a to learn more about how to create NSG rules. 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. Azure Application Gateway health probe error with "Backend server Follow steps 1-10 in the preceding section to upload the correct trusted root certificate to Application Gateway. This is the exact thing what we do when import .CER file in the HTTP Settings of the Application Gateway. Solution: To resolve this issue, verify that the certificate on your server was created properly. One pool has 2 servers listed as unhealthy and the error message we see is below: "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. 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. 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 For information about how to configure a custom probe, see the documentation page. Follow steps 1-11 in the preceding method to upload the correct trusted root certificate to Application Gateway. @EmreMARTiN , you mentioned your backend certificate is from "Digicert" which is already a well-known trusted CA. d. Otherwise, change the next hop to Internet, select Save, and verify the backend health. The gateway listener is configured to accept HTTPS connections. 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. OpenSSL> s_client -connect 10.0.0.4:443 -servername www.example.com -showcerts 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. To increase the timeout value, follow these steps: Message: Application Gateway could not create a probe for this backend. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. 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. If the backend health is shown as Unknown, the portal view will resemble the following screenshot: This behavior can occur for one or more of the following reasons: Check whether your NSG is blocking access to the ports 65503-65534 (v1 SKU) or 65200-65535 (v2 SKU) from Internet: a. c. If the next hop is virtual network gateway, there might be a default route advertised over ExpressRoute or VPN. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Message: The root certificate of the server certificate used by the backend doesn't match the trusted root certificate added to the application gateway. Sign in to the machine where your application is hosted. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. Now Clients will check the Server certificate and confirm if the certificate is issued by Trusted root or not. If the server returns any other status code, it will be marked as Unhealthy with this message. Change the host name or path parameter to an accessible value. @krish-gh actually it was actually what have i tried firstly but sitouiotion was same. Azure Application Gateway: 502 error due to backend certificate not Content Discovery initiative April 13 update: Related questions using a Review our technical responses for the 2023 Developer Survey, Azure Application Gateway Probe Configuration, Azure App Gateway gives Error 404 but backend probe is healthy, Azure Application Gateway Health Probe Error, Azure Application Gateway : Backend server certificate expired. An Azure service that provides a platform-managed, scalable, and highly available application delivery controller as a service. @TravisCragg-MSFT : Thank you! #please-close. d. If an NSG is configured, search for that NSG resource on the Search tab or under All resources. You can verify by using the Connection Troubleshoot option in the Application Gateway portal. Solution: Depending on the backend server's response code, you can take the following steps. Document Details This configuration further secures end-to-end communication. If it's not, the certificate is considered invalid, and that will create a Error message shown - Backend server certificate is not whitelisted with Application Gateway. Open the Application Gateway HTTP Settings page in the Azure portal. 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 ? Already on GitHub? 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. For a TLS/SSL certificate to be trusted, the backend server certificate must be issued by a CA that's included in the trusted store of Application Gateway. You signed in with another tab or window. 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. The default probe request is sent in the format of ://127.0.0.1:. If you open your certificate with Notepad and it doesn't look similar to this, typically this means you didn't export it using the Base-64 encoded X.509(.CER) format. How to connect to new Wi-Fi in Windows 11? 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? Cause: Application Gateway checks whether the host name specified in the backend HTTP settings matches that of the CN presented by the backend servers TLS/SSL certificate. If you don't mind can you please post the summary of the root here to help people who might face similar issue. 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. If you are not familiar with Cloud Shell, it allows you to access bash or powershell from your browser to run commands within your Azure subscription https://docs.microsoft.com/en-us/azure/cloud-shell/overview. Learn how your comment data is processed. I had to add a directive in the webserver conf file to enable presentation of the full trust chain. (These steps are for Windows clients.). Which ability is most related to insanity: Wisdom, Charisma, Constitution, or Intelligence? Azure Application Gateway with an internal APIM Open a command prompt (Win+R -> cmd), enter netstat, and select Enter. Cause: Application Gateway resolves the DNS entries for the backend pool at time of startup and doesn't update them dynamically while running. 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 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. Expected:{HTTPStatusCode0} Received:{HTTPStatusCode1}. Have a question about this project? Export trusted root certificate (for v2 SKU): To learn more visit https://aka.ms/authcertificatemismatch". 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. 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" Sharing best practices for building any app with .NET. Every documentation page has a feedback section at the bottom. Thanks. 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. If the backend health status is Unhealthy, the portal view will resemble the following screenshot: Or if you're using an Azure PowerShell, CLI, or Azure REST API query, you'll get a response that resembles the following example: After you receive an unhealthy backend server status for all the servers in a backend pool, requests aren't forwarded to the servers, and Application Gateway returns a "502 Bad Gateway" error to the requesting client. Also, please let me know your ticket number so that I can track it internally. Azure Tip #3 What is Scale up and Scale Out ? You must be a registered user to add a comment. To resolve the issue, follow these steps. However, we need few details. @sajithvasu This lab takes quite a long time to set up! 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 @JeromeVigne did you find a solution in your setup? End-to-end SSL with Application Gateway v2 requires the backend server's certificate to be verified in order to deem the server Healthy. Please log in using one of these methods to post your comment: You are commenting using your WordPress.com account. backend server, it waits for a response from the backend server for a configured period. I am having the same issue with App GW v1 in front of an API Management. 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. probe setting. 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 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. To Answer we need to understand what happens in any SSL/TLS negotiation. Adding the certificate ensures that the application gateway communicates only with known back-end instances. If they don't match, change the probe configuration so that it has the correct string value to accept. The default route is advertised by an ExpressRoute/VPN connection to a virtual network over BGP. Troubleshoot backend health issues in Application Gateway Now, this is the frustrating partwithin IIS, all of my sites are bound too each specified certificate (sharing a single cert across all the sites wont work for this scenario because of the difference in SSL and URL names), What the MSFT document (https://docs.microsoft.com/en-us/azure/application-gateway/application-gateway-end-to-end-ssl-powershell) fails to tell you, is that you need a Default SITE binding to a certificate, without SNI ticked. After you've figured out the time taken for the application to respond, select the. Your email address will not be published. To troubleshoot this issue, check the Details column on the Backend Health tab. Parabolic, suborbital and ballistic trajectories all follow elliptic paths. Thank you everyone. In 5e D&D and Grim Hollow, how does the Specter transformation affect a human PC in regards to the 'undead' characteristics and spells? c. Check whether any NSG is configured. 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. Let me know here if you face any issue reaching Azure support or if you do not have any support plan for your subscription. After CA autohority re-created the certificate problem was gone. 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. Did the drapes in old theatres actually say "ASBESTOS" on them? Visual Studio Code How to Change Theme ? Opinions, tips, and news orbiting Microsoft. 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. Most of the best practice documentation involves the V2 SKU and not the V1. If you see an Unhealthy or Degraded state, contact support. 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. 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. An existing backend certificate is required to generate the authentication certificates or trusted root certificates required for allowing backend instances with Application Gateway. Nice article mate! 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.

Ice Cream Van Hire Peterborough, Hounslow Visitor Parking Permits, Grease Interceptor Installation Detail, Marvin Johnson Basketball, Articles B