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. If you create the issue from there, the required details will be auto-populated. here is the sample command you need to run, from the linux box that can connect to the backend application. Azure Tip #11 Get Reports of ARM Deployments in Your Subscription. If you can resolve it, restart Application Gateway and check again. If there's a custom DNS server configured on the virtual network, verify that the servers can resolve public domains. If you can resolve the IP address, there might be something wrong with the DNS configuration in the virtual network. Next hop: Azure Firewall private IP address. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. 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. This causes SSL/TLS negoatiation failure and AppGW marks the backend as unhealthy because it is not able to initiate the probe. Also, please let me know your ticket number so that I can track it internally. Thanks. Parabolic, suborbital and ballistic trajectories all follow elliptic paths. 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. I am using the base64 encoded .CER file without the chain (w/o intermediary and root) at the https setting of the backend settings of application gateway and it is working fine (see image below). This usually happens when the FQDN of the backend has not been entered correctly.. We are in the same situation as @JeromeVigne: App Gateway v1 as front-end to API Management, the health probe is unhealthy with the "Backend server certificate is not whitelisted with Application Gateway." Sign up for a free GitHub account to open an issue and contact its maintainers and the community. I will post any updates here as soon as I have them. 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. More info about Internet Explorer and Microsoft Edge, Export trusted root certificate (for v2 SKU), Overview of TLS termination and end to end TLS with Application Gateway, Application Gateway diagnostics and logging. @EmreMARTiN , you mentioned your backend certificate is from "Digicert" which is already a well-known trusted CA. In each case, if the backend server doesn't respond successfully, Application Gateway marks the server as Unhealthy and stops forwarding requests to the server. Sign in I am having the same issue with App GW v1 in front of an API Management. 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. Application Gateway probes can't pass credentials for authentication. To learn more visit https://aka.ms/authcertificatemismatch". On the Application Gateway Overview tab, select the Virtual Network/Subnet link. Follow steps 1a and 1b to determine your subnet. Azure Application Gateway Backend Certificate not whitelisted Error Message: Body of the backend's HTTP response did not match the Passing negative parameters to a wolframscript. Here is a blog post to fix the issue. Next hop: Internet. 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. Access the backend server locally or from a client machine on the probe path, and check the response body. Additionally, if you want to use a different text editor, understand that some editors can introduce unintended formatting in the background. Opinions, tips, and news orbiting Microsoft. Configure that certificate on your backend server. For example: c. If it's not listening on the configured port, check your web server settings. The chain looks ok to me. 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? 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. 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. 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. Open a command prompt (Win+R -> cmd), enter netstat, and select Enter. Asking for help, clarification, or responding to other answers. If it's a self-signed certificate, you must generate a valid certificate and upload the root certificate to the Application Gateway HTTP settings. Solution: Follow these steps to export and upload the trusted root certificate to Application Gateway. Azure Application Gateway: 502 error due to backend certificate not The authentication certificate is the public key of backend server certificates in Base-64 encoded X.509 (.CER) format. Follow steps 1-10 in the preceding section to upload the correct trusted root certificate to Application Gateway. If the domain is private or internal, try to resolve it from a VM in the same virtual network. 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. Your email address will not be published. The gateway listener is configured to accept HTTPS connections. Well occasionally send you account related emails. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. i had this issue for client and split multiple vms ! Azure Tip #7 What are the Storage Tiers in Azure ? 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. 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. To do end to end TLS, Application Gateway requires the backend instances to be allowed by uploading authentication/trusted root certificates. 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. The issue was on certificate. Solution: Depending on the backend server's response code, you can take the following steps. b. @TravisCragg-MSFT: I have same configuration on different places which were built a while ago and those are perfectly working fine. 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. A pfx certificate has also been added. 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" @sajithvasu This lab takes quite a long time to set up! You can verify by using the Connection Troubleshoot option in the Application Gateway portal. 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. Is that we have to follow the below step for resolution ? here is the sample command you need to run, from the machine that can connect to the backend server/application. In this example, you'll use a TLS/SSL certificate for the backend certificate and export its public key to be used as . Message: The root certificate of the server certificate used by the backend doesn't match the trusted root certificate added to the application gateway. For new setup, we have noticed that app gateway back-end becomes unhealthy. After the server starts responding If it is, check the DNS server about why it can't resolve to the IP address of the specified FQDN. When we check the certificate with the openssl there were following errors: Ive recently faced with the dreaded 502 Web Server error when dealing with the App Gateway, my Backend Health was screaming unhealthy Backend server certificate is not whitelisted with Application Gateway. This causes SSL/TLS negoatiation failure and AppGW marks the backend as unhealthy because it is not able to initiate the probe. 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. Find centralized, trusted content and collaborate around the technologies you use most. Open your Application Gateway HTTP settings in the 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. To automate the approach above, within my template I extracted the .cer and .pfx into base64 string using the below PowerShell command: This gave me the ability to upload this into Key Vault, and reference the Secret within my template parameter file, so no credentials or keys are stored in templates, theyre all in Key Vault (all kinds of secure). 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. Configure that certificate on your backend server. 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. 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. c. Check whether any NSG is configured. 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. This configuration further secures end-to-end communication. The text was updated successfully, but these errors were encountered: @EmreMARTiN, Thanks for the feedback. Below is what happens during SSL negotiation when you have single chain cert and root in the AppGW. Find out more about the Microsoft MVP Award Program. Hope this helps. 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. SAP on Azure: Azure Application Gateway Web Application Firewall (WAF 7 19 comments Add a Comment Nillsf 4 yr. ago 10.0.0.4 = IP of backend server (if using DNS ensure it points to backend server and not the public IP of appgw). 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. site bindings in IIS, server block in NGINX and virtual host in Apache. Or, you can use Azure PowerShell, CLI, or REST API. Check the backend server's health and whether the services are running. @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. Thank you everyone. Our current setup includes app gateway v1 SKU integrated with app services having custom domain enabled. 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. Thanks for contributing an answer to Stack Overflow! Have a question about this project? 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. Our backend web server is running Apache with multiple HTTPS sites on the same server and the issue we face is regardless of the HTTPS . Just FYI. Export trusted root certificate (for v2 SKU): By clicking Sign up for GitHub, you agree to our terms of service and 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. Otherwise, it will be marked as Unhealthy with this message. Cause: After Application Gateway sends an HTTP(S) probe request to the 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. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. 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. Thanks. 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. Failing endpoint is missing root CA as working one has it. Check whether the host name path is accessible on the backend server. Alternatively, you can do that through PowerShell/CLI. Verify that the response body in the Application Gateway custom probe configuration matches what's configured. Already on GitHub? Note that this .CER file must match the certificate (PFX) deployed at the backend application. Enabling end to end TLS on Azure 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). Were you able to reproduce this scenario and check? Make sure https probe is configured correctly as well. 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. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. Have raise case with Microsoft as unable to resolve that myself. To do that, follow these steps: Message: The validity of the backend certificate could not be verified. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, Azure Application Gateway health probe error with "Backend server certificate is not whitelisted with Application Gateway", When AI meets IP: Can artists sue AI imitators? This verification is Standard_v2 and WAF_v2 SKU (V2) behavior. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. (LogOut/ On the Subnets tab of your virtual network, select the subnet where Application Gateway has been deployed. This approach is useful in situations where the backend website needs authentication. In this example, requests using TLS1.2 are routed to backend servers in Pool1 using end to end TLS. 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. 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. c. Check to see if there are any default routes (0.0.0.0/0) with the next hop not set as Internet. 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. Default route advertised by the ExpressRoute/VPN connection to the virtual network over BGP: a. Azure Application Gateway: 502 error due to backend certificate not whitelisted in the AppGW, Troubleshoot backend health issues in Azure Application Gateway | Microsoft Docs. If thats not a desired value, you should create a custom probe and associate it with the HTTP settings. You should remove the exported trusted root you added in the App Gateway. I just set it up and cannot get the health probe for HTTPS healthy. 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. In the Certificate properties, select the Details tab. We should get one Linux machine which is in the same subnet/VNET of the backend application and run the following commands. 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. To increase the timeout value, follow these steps: Message: Application Gateway could not create a probe for this backend. -No client certificate CA names sent @TravisCragg-MSFT : Did you find out anything? End-to-end SSL with Application Gateway v2 requires the backend server's certificate to be verified in order to deem the server Healthy. 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 . OpenSSL s_client -connect 10.0.0.4:443 -servername www.example.com -showcerts. respond within the configured period (the timeout value), it's marked as Unhealthy until it starts responding within the configured timeout period again. 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, it waits for a response from the backend server for a configured period. 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? Azure Application Gateway: 502 error due to backend certificate not Certificates required to allow backend servers - Azure Application Gateway How do I bypass Microsoft account login in Windows11? Resolution: Check why the backend server or application isn't responding within the configured timeout period, and also check the application dependencies. During SSL negotiation , Client sends "Client Hello" and Server Responds with "Server Hello" with its Certificate to the Client. Message: Status code of the backend's HTTP response did not match the probe setting. Reference document: https://learn.microsoft.com/en-us/azure/application-gateway/ssl-overview#for-probe-traffic. During SSL negotiation , Client sends Client Hello and Server Responds with Server Hello with its Certificate to the Client. If you're using a default probe, the host name will be set as 127.0.0.1. Message: The backend health status could not be retrieved. Content: <---> Configure that certificate on your backend server. At the time of writing the Application Gateway doesnt support uploading the Certificates directly into Key Vault, hence extracting the string into .txt and dumping it in Key Vault Secrets. Service unavailable. 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. 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 Application Gateway WAF end to end SSL - Microsoft Community Hub Thanks! Solution: To resolve this issue, verify that the certificate on your server was created properly. 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. Azure Application Gateway health probe error with "Backend server Azure Application Gateway Backend Setting Certificate error 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. (LogOut/ 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. 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 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. Thanks for this information. GitHub Login: <---> Ensure that you add the correct root certificate to whitelist the backend". Learn more about Application Gateway diagnostics and logging. d. If an NSG is configured, search for that NSG resource on the Search tab or under All resources. Solution: If your TLS/SSL certificate has expired, renew the certificate Unfortunately I have to use the v1 for this set-up. "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. Did the drapes in old theatres actually say "ASBESTOS" on them? Make sure the UDR isn't directing the traffic away from the backend subnet. Ended up swapping to App Gateway V2 instead using the Trusted CA cert option on the backend http settings. The exported certificate looks similar to this: If you open the exported certificate using Notepad, you see something similar to this example. You signed in with another tab or window. Configure that certificate on your backend server. For the v1 SKU, authentication certificates are required, but for the v2 SKU trusted root certificates are required to allow the certificates. Cause: When you create a custom probe, you can mark a backend server as Healthy by matching a string from the response body. Is there such a thing as "right to be heard" by the authorities? And each pool has 2 servers . Azure Tip #3 What is Scale up and Scale Out ? 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. of the server certificate used by the backend does not match the trusted root certificate added to 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. 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. Expected:{HTTPStatusCode0} Received:{HTTPStatusCode1}. I will now proceed to close this github issue here since this repo is for MS Docs specifically. with open ssl i should run the command on from local server ? 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 ", 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.". 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 the same issue, Root cert is DigiCert. 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. I am currently experimenting with different ways to add the backend pools and heath probes to find a working configuration. The custom DNS server is configured on a virtual network that can't resolve public domain names. How to connect to new Wi-Fi in Windows 11? 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. Your email address will not be published. Message: The Common Name (CN) of the backend certificate doesn't match the host header of the probe. or is that all the backend pools has to serve the request for one application ? 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. For File to Export, Browse to the location to which you want to export the certificate. In this article I am going to talk about one most common issue "backend certificate not whitelisted" Service:<---> 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. 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. Access the backend server directly and check the time taken for the server to respond on that page. For example, http://127.0.0.1:80 for an HTTP probe on port 80. Move to the Certification Path view to view the certification authority. Sure I would be glad to get involved if needed. Backend Authentication certificate issue #40941 - Github This can create problems when uploaded the text from this certificate to Azure. For information about how to configure a custom probe, see the documentation page. If Pick hostname from backend address is set in the HTTP settings, the backend address pool must contain a valid FQDN. Have a question about this project? 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. We should get one Linux machine which is in the same subnet/VNET of the backend application and run the following commands.
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