Check whether your UDR has a default route (0.0.0.0/0) with the next hop not set as Internet: a. Create a free website or blog at WordPress.com. Not the answer you're looking for? In the Certificate properties, select the Details tab. 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 . On the Application Gateway Overview tab, select the Virtual Network/Subnet link. 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. Do not edit this section. Because the probe requests don't carry any user credentials, they will fail, and an HTTP 401 status code will be returned by the backend server. 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. But if this message is displayed, it suggests that Application Gateway couldn't successfully resolve the IP address of the FQDN entered. 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. Client has renewed cert which is issued by GlobalSign and one of the listeners started to fail with same error. Next hop: Internet. Cause: After the DNS resolution phase, Application Gateway tries to connect to the backend server on the TCP port that's configured in the HTTP settings. For more information about how to extract and upload Trusted Root Certificates in Application Gateway, see Export trusted root certificate (for v2 SKU). 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 Passing negative parameters to a wolframscript. c. Check whether any NSG is configured. 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. Check the document page that's provided in step 3a to learn more about how to create NSG rules. This can create problems when uploaded the text from this certificate to Azure. You'll see the Certificate Export Wizard. Either allow "HTTP 401" in a probe status code match or probe to a path where the serverdoesn't require authentication. If there is, search for the resource on the search bar or under All resources. If you do not have a support plan, please let me know. to your account. For the v1 SKU, authentication certificates are required, but for the v2 SKU trusted root certificates are required to allow the certificates. 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. I have tried to upload root CA instead of using well-known CA and the issue persist. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. 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 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. Check whether the NSG settings of the Application Gateway subnet allow outbound public and private traffic, so that a connection can be made. Visual Studio Code How to Change Theme ? On the Details tab, select the Copy to File option and save the file in the Base-64 encoded X.509 (.CER) format. 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. Were you able to reproduce this scenario and check? I will post the root cause summary once there is an outcome from your open support case. The certificate that has been uploaded to Application Gateway HTTP settings must match the root certificate of the backend server certificate. Can you post the output please after masking any sensitive info? The output should show the full certificate chain of trust, importantly, the root certificate which is the one appgw requires. AppGW is a PaaS instance , by default you wont get access to the Applicaiton Gateway. Is there a generic term for these trajectories? (Ep. From your TLS/SSL certificate, export the public key .cer file (not the private key). 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. Your email address will not be published. with open ssl i should run the command on from local server ? Well occasionally send you account related emails. Trusted root certificate mismatch 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. @EmreMARTiN , following up to see if the support case resolved your issue. The text was updated successfully, but these errors were encountered: @sajithvasu I am not aware of any changes that have been made on the App Gateway side that would make this not work. 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. It worked fine for me with the new setup in the month of September with V1 SKU. OpenSSL s_client -connect 10.0.0.4:443 -servername www.example.com -showcerts. If you're using a default probe, the host name will be set as 127.0.0.1. 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. Set the destination port as anything, and verify the connectivity. There is certificate with private key as PFX on listenner settings. Find centralized, trusted content and collaborate around the technologies you use most. b. Thanks. 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. Have done s_client -connect backend_ip:443 -servername backend_url -showcerts and found that Root CA is missing. 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. 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. From the properties displayed, find the CN of the certificate and enter the same in the host name field of the http settings. rev2023.5.1.43405. 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. 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. Currently we are seeing issues with app gateway backend going unhealthy due to backend auth cert. In this article I am going to talk about one most common issue "backend certificate not whitelisted" document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Azure Application Gateway 502 Web Server Backend Certificate not whitelisted. If it's a self-signed certificate, you must generate a valid certificate and upload the root certificate to the Application Gateway HTTP settings. Azure Tip #7 What are the Storage Tiers in Azure ? Allow the backend on the Application Gateway by uploading the root certificate of the server certificate used by the backend. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. An authentication certificate is required to allow backend instances in Application Gateway v1 SKU. 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. with open ssl all looks okey i can see all chains. If your backend is within a VNET not accessible from your local, the you run openssl from a Cloud Shell within VNET. If it's not, the certificate is considered invalid, and that will create a f. Select Save and verify that you can view the backend as Healthy. To increase the timeout value, follow these steps: Message: Application Gateway could not create a probe for this backend. Unfortunately I have to use the v1 for this set-up. This operation can be completed via Azure PowerShell or Azure CLI. 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. I just set it up and cannot get the health probe for HTTPS healthy. 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. 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 Already on GitHub? @sajithvasu My apologies for this taking a long time, but there are some strange issues here(as you have already discovered). The current data must be within the valid from and valid to range. The authentication certificate is the public key of backend server certificates in Base-64 encoded X.509(.CER) format. Page not found. 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. This is the exact thing what we do when import .CER file in the HTTP Settings of the Application Gateway. When calculating CR, what is the damage per turn for a monster with multiple attacks? 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.

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