AppGW is a PaaS instance , by default you wont get access to the Applicaiton Gateway. If there is, search for the resource on the search bar or under All resources. ", The UDR on the Application Gateway subnet is set to the default route (0.0.0.0/0) and the next hop is not specified as "Internet.". Backend pools show as unhealthy in azure application gateway Trusted root certificate mismatch For the v1 SKU, authentication certificates are required, but for the v2 SKU trusted root certificates are required to allow the certificates. In this example, requests using TLS1.2 are routed to backend servers in Pool1 using end to end TLS. Message: Backend certificate is invalid. To do that, follow these steps: Message: The validity of the backend certificate could not be verified. Which was the first Sci-Fi story to predict obnoxious "robo calls"? The status retrieved by any of these methods can be any one of the following states: If the backend health status for a server is healthy, it means that Application Gateway will forward the requests to that server. I am having the same issue with App GW v1 in front of an API Management. Did the drapes in old theatres actually say "ASBESTOS" on them? For testing purposes, you can create a self-signed certificate but you shouldn't use it for production workloads. d. If an NSG is configured, search for that NSG resource on the Search tab or under All resources. How do I bypass Microsoft account login in Windows11? By clicking Sign up for GitHub, you agree to our terms of service and Internal server error. privacy statement. This month for new environment build we started encountering this problem. Nice article mate! How to Change Network Location to Private, Public, or Domain in Windows 11? The exported certificate looks similar to this: If you open the exported certificate using Notepad, you see something similar to this example. 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.. After CA autohority re-created the certificate problem was gone. 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. Can you please add reference to relevant Microsoft Docs page you are following? An Azure service that provides a platform-managed, scalable, and highly available application delivery controller as a service. Expected:{HTTPStatusCode0} Received:{HTTPStatusCode1}. Reference document: https://learn.microsoft.com/en-us/azure/application-gateway/ssl-overview#for-probe-traffic. 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. 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. Client has renewed cert which is issued by GlobalSign and one of the listeners started to fail with same error. Microsoft Word Multiple Choice Questions & Answers, Excel Multiple Choice Questions & Answers, Different Ways to Change Power Button Action in Windows 11. Your email address will not be published. Do not edit this section. Service: application-gateway; GitHub Login: @vhorne; Microsoft Alias: absha; The text was updated successfully, but these errors were encountered: . 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. Configure that certificate on your backend server. 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. Ensure that you add the correct root certificate to whitelist the backend. This will take some time to track down, fix, and the docs will need to be updated with limitations & best practices. 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. Now Clients will check the Server certificate and confirm if the certificate is issued by Trusted root or not. 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. Thanks. Azure Application Gateway: 502 error due to backend certificate not 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 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. 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. How to organize your open apps in windows 11? to your account. Backend Health page on the Azure portal. 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. Let me know here if you face any issue reaching Azure support or if you do not have any support plan for your subscription. Next hop: Azure Firewall private IP address. But when we have multiple chain certificate and your backend application is sending the Application Gateway only the leaf the certificate , AppGW will not be able to trust the cert up to the top level domain root. "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. 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. 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. . An authentication certificate is required to allow backend instances in Application Gateway v1 SKU. If the domain is private or internal, try to resolve it from a VM in the same virtual network. Application Gateway is in an Unhealthy state. c. Check the user-defined routes (UDR) settings of Application Gateway and the backend server's subnet for any routing anomalies. Check whether the virtual network is configured with a custom DNS server. Now Clients will check the Server certificate and confirm if the certificate is issued by Trusted root or not. 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. Required fields are marked *. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. I can confirm that it's NOT a general issue or bug of the product. Well occasionally send you account related emails. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. (Ep. If you create the issue from there, the required details will be auto-populated. i had this issue for client and split multiple vms ! 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. 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. In this article I am going to talk about one most common issue "backend certificate not whitelisted" . Save the custom probe settings and check whether the backend health shows as Healthy now. 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. You can add this to the application gateway to allow your backend servers for end to end TLS encryption. -> Same certificate with private key from applicaton server. Then, click Next. Well occasionally send you account related emails. Already on GitHub? Applicaiton works fine on the backend servers with 443 certificate from Digicert. To do the whitlisting, you will need to export APIM SSL certificate into a Base-64 encoded (CER) format, and apply the exported certificate in (Backend authentication certificates) under the Application Gateway's HTTP settings configured for the APIM. 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. 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. b. 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. 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 should see the root certificate details. Our current setup includes app gateway v1 SKU integrated with app services having custom domain enabled. Allow the backend on the Application Gateway by uploading the root certificate of the server certificate used by the backend. Application Gateway probes can't pass credentials for authentication. 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. You can use any tool to access the backend server, including a browser using developer tools. Is "I didn't think it was serious" usually a good defence against "duty to rescue"? 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. The intermediate certificate(s) should be bundled with server certificate and installed on the backend server. To learn more, see our tips on writing great answers. 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. to your account. For example, run the following command: Test-NetConnection -ComputerName www.bing.com -Port 443. The current data must be within the valid from and valid to range. This usually happens when the FQDN of the backend has not been entered correctly.. 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. If your certificate is working on browser directly hitting the app and not with AppGW then what is the exact problem? If you're using a default probe, the host name will be set as 127.0.0.1. Enabling end to end TLS on Azure Application Gateway Access the backend server locally or from a client machine on the probe path, and check the response body. Verify that the response body in the Application Gateway custom probe configuration matches what's configured. b. Do not edit this section. Check the backend server's health and whether the services are running. For example: When we check the certificate with the openssl there were following errors: 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. 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. 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. We are actually trying to simulate the Linux box as AppGW. This approach is useful in situations where the backend website needs authentication. 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. A few of the common status codes are listed here: Or, if you think the response is legitimate and you want Application Gateway to accept other status codes as Healthy, you can create a custom probe. Ensure that you add the correct root certificate to whitelist the backend". If the server returns any other status code, it will be marked as Unhealthy with this message. By default, Azure Application Gateway probes backend servers to check their health status and to check whether they're ready to serve requests. An authentication certificate is required to allow backend instances in Application Gateway v1 SKU. Select the root certificate and click on View Certificate. For more information about how to extract and upload Trusted Root Certificates in Application Gateway, see Export trusted root certificate (for v2 SKU). 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. Current date is not within the "Valid from" and "Valid to" date range on the certificate. Make sure the UDR isn't directing the traffic away from the backend subnet. An issue with your configuration needs to be ruled out first. If there's a custom probe associated with the HTTP settings, SNI will be set from the host name mentioned in the custom probe configuration. Sub-service: <---> To learn more visit https://aka.ms/authcertificatemismatch". I will wait for your response. 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. 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. The HTTP setting of the gateway is configured as follow: I've provided, hopefully, the correct root certificate for the setting. For example, check whether the database has any issues that might trigger a delay in response. The application gateway then tries to connect to the server on the TCP port mentioned in the HTTP settings. So, I created a default site pointed it to wwwroot, and selected one of my already installed certificates (you can probably PowerShell an SSL for this tbh, but I chose to re-use an already existing one) you dont have to supply a hostname, just a dummy site with an authenticated cert on port 443. 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 ? To Answer we need to understand what happens in any SSL/TLS negotiation. @EmreMARTiN , you mentioned your backend certificate is from "Digicert" which is already a well-known trusted CA. 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. Now how do we find if my application/backendserver is sending the complete chain to AppGW? The chain looks ok to me. Is there a generic term for these trajectories? document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Azure Application Gateway 502 Web Server Backend Certificate not whitelisted. Just FYI. To Answer we need to understand what happens in any SSL/TLS negotiation. 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. We have this setup in multiple places created last year and it all works fine. 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. Parabolic, suborbital and ballistic trajectories all follow elliptic paths. AppGW is a PaaS instance , by default you wont get access to the Applicaiton Gateway. Currently we are seeing issues with app gateway backend going unhealthy due to backend auth cert. here is what happens in in Multiple chain certificate. Create a free website or blog at WordPress.com. If your certificate is working on browser directly hitting the app and not with AppGW then what is the exact problem? I will wait for the outcome. Azure Application Gateway: 502 error due to backend certificate not whitelisted in the AppGW, Troubleshoot backend health issues in Azure Application Gateway | Microsoft Docs. with open ssl all looks okey i can see all chains. If you want Application Gateway to probe on a different protocol, host name, or path and to recognize a different status code as Healthy, configure a custom probe and associate it with the HTTP settings. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. I am 3 backend pools . 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. OpenSSL> s_client -connect 10.0.0.4:443 -servername www.example.com -showcerts or from external over WAF ? OpenSSL s_client -connect 10.0.0.4:443 -servername www.example.com -showcerts. @TravisCragg-MSFT: I have same configuration on different places which were built a while ago and those are perfectly working fine. Issue within certification chain using azure application gateway
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