The current data must be within the valid from and valid to range. 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. 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. I will let you know what I find. If Pick hostname from backend address is set in the HTTP settings, the backend address pool must contain a valid FQDN. 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. @TravisCragg-MSFT: Any luck? The HTTP setting of the gateway is configured as follow: I've provided, hopefully, the correct root certificate for the setting. @sajithvasu My apologies for this taking a long time, but there are some strange issues here(as you have already discovered). Here is a blog post to fix the issue. 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. Verify that the response body in the Application Gateway custom probe configuration matches what's configured. How to organize your open apps in windows 11? Open a command prompt (Win+R -> cmd), enter netstat, and select Enter. OpenSSL s_client -connect 10.0.0.4:443 -servername www.example.com -showcerts. To do that, follow these steps: Message: The validity of the backend certificate could not be verified. Connect and share knowledge within a single location that is structured and easy to search. Backend Authentication certificate issue #40941 - Github If the setting is either Virtual Appliance or Virtual Network Gateway, you must make sure that your virtual appliance, or the on-premises device, can properly route the packet back to the Internet destination without modifying the packet. If the backend server response for the probe request contains the string unauthorized, it will be marked as 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". Cause: When you create a custom probe, you can mark a backend server as Healthy by matching a string from the response body. You should remove the exported trusted root you added in the App 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 . 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. Make sure https probe is configured correctly as well. A few things to check: a. Cause: If the backend pool is of type IP Address, FQDN or App Service, Application Gateway resolves to the IP address of the FQDN entered through DNS (custom or Azure default). You can verify by using the Connection Troubleshoot option in the Application Gateway portal. b. For example: c. If it's not listening on the configured port, check your web server settings. Also, in this example, you'll use the Windows Certificate Manager tool to export the required certificates. To verify, you can use OpenSSL commands from any client and connect to the backend server by using the configured settings in the Application Gateway probe. During SSL negotiation , Client sends Client Hello and Server Responds with Server Hello with its Certificate to the Client. Received response body doesn't contain {string}. Enter any timeout value that's greater than the application response time, in seconds. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Ensure that you add the correct root certificate to whitelist the backend". I will post any updates here as soon as I have them. 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 . It is required for docs.microsoft.com GitHub issue linking. How to Restart Windows Explorer Process in Windows 11? Your email address will not be published. privacy statement. We should get one Linux machine which is in the same subnet/VNET of the backend application and run the following commands. Azure Tip #3 What is Scale up and Scale Out ? To create a custom probe, follow these steps. This approach is useful in situations where the backend website needs authentication. b. The root certificate is a Base-64 encoded X.509(.CER) format root certificate from the backend server certificates. Thanks for this information. The certificate that has been uploaded to Application Gateway HTTP settings must match the root certificate of the backend server certificate. If Internet and private traffic are going through an Azure Firewall hosted in a secured Virtual hub (using Azure Virtual WAN Hub): a. This is the exact thing what we do when import .CER file in the HTTP Settings of the Application Gateway. Backend protocol: HTTPS Backend port: 443 Use well known CA certificate: Yes Cookie-based affinity*: Disable Connection draining*: Disable Request time-out*: 20 seconds Override backend path*: Blank Override with new host name: Yes Host name override: Override with a specific domain name (webappX.hugelab.net) Use custom probe: Yes This operation can be completed via Azure PowerShell or Azure CLI. Reference document: https://learn.microsoft.com/en-us/azure/application-gateway/ssl-overview#for-probe-traffic. When calculating CR, what is the damage per turn for a monster with multiple attacks? EDIT: Turned out I uploaded wrong pfx compared to the backend server. Find out more about the Microsoft MVP Award Program. Now Clients will check the Server certificate and confirm if the certificate is issued by Trusted root or not. 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. Now Clients will check the Server certificate and confirm if the certificate is issued by Trusted root or not. In Azure docs, it is clearly documented that you dont have to import Auth certificate in HTTP settings of the backend if your backend application has Global trusted certificate. The reason why I try to use CA cert is that I manage all the resource in terraform, with a single CA cert, it is better to automate the process. In this example, you'll use a TLS/SSL certificate for the backend certificate and export its public key to be used as . Did the drapes in old theatres actually say "ASBESTOS" on them? Passing negative parameters to a wolframscript. 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. Content: <---> "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. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Azure Application Gateway 502 Web Server Backend Certificate not whitelisted. Most of the browsers are thick clients , so it may work in the new browsers but reverse proxies like Application Gateway wont behave like our browsers they only trust the certificates if the backend sends the complete chain. I will post the root cause summary once there is an outcome from your open support case. In the Certificate properties, select the Details tab. What was the resolution? Next hop: Azure Firewall private IP address. To allow this access, upload trusted root certificates (for v2 SKU) of the back-end servers to the application gateway. 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. Only HTTP status codes of 200 through 399 are considered healthy. Sorry my bad, this is actually now working - I just needed to have the CN in the certificate match with what was set in backend pool. @TravisCragg-MSFT : Did you find out anything? 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 Answer we need to understand what happens in any SSL/TLS negotiation. Solution: Follow these steps to export and upload the trusted root certificate to Application Gateway. Sign in 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. The v2 SKU is not an option at the moment due to lack of UDR support. If the certificate wasn't issued by a trusted CA (for example, a self-signed certificate was used), users should upload the issuer's certificate to Application Gateway. If the certificate wasn't issued by a trusted CA (for example, a self-signed certificate was used), users should upload the issuer's certificate to Application Gateway. Your certificate is successfully exported. 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. 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. Follow steps 1-10 in the preceding section to upload the correct trusted root certificate to Application Gateway. Message: The backend health status could not be retrieved. 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." Applicaiton works fine on the backend servers with 443 certificate from Digicert. Learn more about Application Gateway diagnostics and logging. From your TLS/SSL certificate, export the public key .cer file (not the private key). 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. How did you verify the cert? Otherwise please share the message in that scenario without adding root explicitly. I am 3 backend pools . After the server starts responding I have tried to upload root CA instead of using well-known CA and the issue persist. If you don't mind can you please post the summary of the root here to help people who might face similar issue. here is what happens in in Multiple chain certificate. Just FYI. Sign up for a free GitHub account to open an issue and contact its maintainers and the community. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Design a site like this with WordPress.com, Troubleshoot backend health issues in Azure Application Gateway | Microsoft Docs. I just set it up and cannot get the health probe for HTTPS healthy. here is the sample command you need to run, from the machine that can connect to the backend server/application. Default route advertised by the ExpressRoute/VPN connection to the virtual network over BGP: a. This usually happens when the FQDN of the backend has not been entered correctly.. It is required for docs.microsoft.com GitHub issue linking. 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/ssl-overview#end-to-end-tls-with-the-v2-sku. 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. 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. Nice article mate! Ensure that you add the correct root certificate to whitelist the backend. 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. i had this issue for client and split multiple vms ! Ensure that you add the correct root certificate to allowlist the backend. 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. Making statements based on opinion; back them up with references or personal experience. craigclouditpro your a lifesaver thanks for posting this friend ! To find out the reason, check OpenSSL diagnostics for the message associated with error code {errorCode}. If you can't connect on the port from your local machine as well, then: a. Sub-service: <---> An issue with your configuration needs to be ruled out first. 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. Client has renewed cert which is issued by GlobalSign and one of the listeners started to fail with same error. Well occasionally send you account related emails. Is there a generic term for these trajectories?

Merv Griffin Show Archives, How Did The Mandate System Affect The Middle East, Articles B