Create a free website or blog at WordPress.com. Just FYI. You must be a registered user to add a comment. I will wait for the outcome. 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. You signed in with another tab or window. Your certificate is successfully exported. If Pick hostname from backend address is set in the HTTP settings, the backend address pool must contain a valid FQDN. Your email address will not be published. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. Now you may ask why it works when you browse the backend directly through browser. 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. You should remove the exported trusted root you added in the App Gateway. PS : Dont forget to upload the CER file to the HTTP settings in ApplicationGateway before you do the Health Check. I have the same issue, Root cert is DigiCert. Trusted root certificate mismatch 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 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. respond within the configured period (the timeout value), it's marked as Unhealthy until it starts responding within the configured timeout period again. GitHub Login: <---> In this example, you'll use a TLS/SSL certificate for the backend certificate and export its public key to be used as . Document Details Ensure that you add the correct root certificate to whitelist the backend". To find out the reason, check OpenSSL diagnostics for the message associated with error code {errorCode}. To learn more visit https://aka.ms/authcertificatemismatch" I have some questions in regards to application gateway and need help with the same : The protocol and destination port are inherited from the HTTP settings. 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. Export trusted root certificate (for v2 SKU): For example, run the following command: Test-NetConnection -ComputerName www.bing.com -Port 443. Thanks in advance. This configuration further secures end-to-end communication. If the backend server doesn't Also, in this example, you'll use the Windows Certificate Manager tool to export the required certificates. b. The issue was on certificate. to your account. Can you post the output please after masking any sensitive info? @TravisCragg-MSFT: Any luck? Learn how your comment data is processed. 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. 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. The authentication certificate is the public key of backend server certificates in Base-64 encoded X.509(.CER) format. Thanks. Message: Time taken by the backend to respond to application gateway's health probe is more than the timeout threshold in the probe setting. To troubleshoot this issue, check the Details column on the Backend Health tab. 7 19 comments Add a Comment Nillsf 4 yr. ago Check whether the backend server requires authentication. 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. The custom DNS server is configured on a virtual network that can't resolve public domain names. Backend Health page on the Azure portal. 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. I will now proceed to close this github issue here since this repo is for MS Docs specifically. i.e. How did you verify the cert? 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. Configure that certificate on your backend server. For example, you can configure Application Gateway to accept "unauthorized" as a string to match. Would you like to involve with it ? 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. Check the backend server's health and whether the services are running. 2)How should we get this issue fixed ? By clicking Sign up for GitHub, you agree to our terms of service and 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 ? For example, check whether the database has any issues that might trigger a delay in response. If you see an Unhealthy or Degraded state, contact support. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. Our current setup includes app gateway v1 SKU integrated with app services having custom domain enabled. If you've already registered, sign in. 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. Microsoft Alias: <--->. For new setup, we have noticed that app gateway back-end becomes unhealthy. 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. For example: 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. 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. site bindings in IIS, server block in NGINX and virtual host in Apache. This will take some time to track down, fix, and the docs will need to be updated with limitations & best practices. We should get one Linux machine which is in the same subnet/VNET of the backend application and run the following commands. 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 resolve the issue, follow these steps. Configure that certificate on your backend server. 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. 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. -> Same certificate with private key from applicaton server. d. If an NSG is configured, search for that NSG resource on the Search tab or under All resources. Was the error "exactly" the same before you explicitly added the exported root rather than relying on "Digicert" as known authority? Now Clients will check the Server certificate and confirm if the certificate is issued by Trusted root or not. 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. Is that we have to follow the below step for resolution ? For File name, name the certificate file. To do that, follow these steps: Message: The validity of the backend certificate could not be verified. Received response body doesn't contain {string}. This post has been republished via RSS; it originally appeared at: New blog articles in Microsoft Tech Community. 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. You can add this to the application gateway to allow your backend servers for end to end TLS encryption. 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. Already on GitHub? Currently we are seeing issues with app gateway backend going unhealthy due to backend auth cert. with open ssl all looks okey i can see all chains. In this example, we'll use a TLS/SSL certificate for the backend certificate, export its public key and then export the root certificate of the trusted CA from the public key in base64 encoded format to get the trusted root certificate. Note that this .CER file must match the certificate (PFX) deployed at the backend application. 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. c. Check the user-defined routes (UDR) settings of Application Gateway and the backend server's subnet for any routing anomalies. To create a custom probe, follow these steps. @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. Cause: This error occurs when Application Gateway can't verify the validity of the certificate. Check whether your server allows this method. 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. If they don't match, change the probe configuration so that it has the correct string value to accept. By clicking Sign up for GitHub, you agree to our terms of service and Azure Tip #3 What is Scale up and Scale Out ? 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. Required fields are marked *. 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. 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. d. Check your OS firewall settings to make sure that incoming traffic to the port is allowed. 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. Opinions, tips, and news orbiting Microsoft. 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. Check whether the NSG settings of the Application Gateway subnet allow outbound public and private traffic, so that a connection can be made. I did not find this error message listed here https://learn.microsoft.com/en-us/azure/application-gateway/application-gateway-backend-health-troubleshooting. Change the host name or path parameter to an accessible value. This is the exact thing what we do when import .CER file in the HTTP Settings of the Application Gateway. If it's a self-signed certificate, you must generate a valid certificate and upload the root certificate to the Application Gateway HTTP settings. @EmreMARTiN , you mentioned your backend certificate is from "Digicert" which is already a well-known trusted CA. here is what happens in in Multiple chain certificate. This article describes the symptoms, cause, and resolution for each of the errors shown. The root certificate is a Base-64 encoded X.509(.CER) format root certificate from the backend server certificates. It is required for docs.microsoft.com GitHub issue linking. Find out more about the Microsoft MVP Award Program. Did the drapes in old theatres actually say "ASBESTOS" on them? Current date is not within the "Valid from" and "Valid to" date range on the certificate. The authentication certificate is the public key of backend server certificates in Base-64 encoded X.509 (.CER) format. c. Check whether any NSG is configured. Passing negative parameters to a wolframscript. Access the backend server locally or from a client machine on the probe path, and check the response body. I am 3 backend pools . In this article I am going to talk about one most common issue "backend certificate not whitelisted" An authentication certificate is required to allow backend instances in Application Gateway v1 SKU. Ensure that you add the correct root certificate to whitelist the backend". Which language's style guidelines should be used when writing code that is supposed to be called from another language? If Application Gateway can't establish a TCP session on the port specified, the probe is marked as Unhealthy with this message. @krish-gh actually it was actually what have i tried firstly but sitouiotion was same. When i check health probe details are following: We have this setup in multiple places created last year and it all works fine. Configure that certificate on your backend server. How to connect to new Wi-Fi in Windows 11? On the Details tab, select the Copy to File option and save the file in the Base-64 encoded X.509 (.CER) format. Make sure the UDR isn't directing the traffic away from the backend subnet. 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. After the server starts responding Message: The backend health status could not be retrieved. Follow steps 1-11 in the preceding method to upload the correct trusted root certificate to Application Gateway. 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).
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