Azure app service intermittent 502. I chose Linux + Node LTS environment.
Azure app service intermittent 502 We configured listeners, backendpool, backendsettings and routing rules but not able to process the request from… Aug 9, 2023 · An Azure service that provides a platform-managed, scalable, and highly available application delivery controller as a service. Mar 24, 2020 · Azure App Service is a service used to create and deploy scalable, mission-critical web apps. Mentions of Cloudflare, Nginx, or Apache indicate server configuration issues, while proxy references show proxy errors. NET 8, exposes both gRPC and WebSocket endpoints, and also serves web pages. Mar 7, 2024 · An Azure service that provides an event-driven serverless compute platform. I have a Azure Function app with a HTTP trigger endpoint that intermittently returns 502 errors. Apr 18, 2024 · Hi there, I have a web app deployed on Azure App Service which is hosting a Django application. In the Logic App when I am using Aug 11, 2022 · You'll need to complete a few actions and gain 15 reputation points before being able to upvote. Aug 2, 2018 · Azure Application Gateway error 502 - Web server received an invalid response while acting as a gateway or proxy server. #2 , follow from Move VSTS repo to Github #1 Jan 14, 2021 · 120111221001214 @StephanNel - did you ever determine the root cause and steps to resolve this issue? We are experiencing a similar issue with an intermittent 502 Bad Gateway error, but no indications of why or exactly where between the App Gateway -> APIC -> backend API server the unhealthy condition is coming from to cause the 502. So I looked into "Diagnose and solve… Jun 24, 2020 · You may follow this article Troubleshoot HTTP errors of "502 bad gateway" and "503 service unavailable" in Azure App Service to identify the issue, Also, make sure there is no network connection broken on your side. May 26, 2023 · In this article, you will find the steps on how to troubleshoot HTTP “502 Bad Gateway” error or a HTTP “503 Service unavailable” error. Scaling up an app involves two related actions: changing your App Service plan to a higher pricing tier and configuring certain settings after you have switched to the higher pricing tier. Nov 3, 2025 · All these variations represent the same 502 error, with wording depending on the browser or server. Watching the log stream, I've discovered that the 50 Nov 28, 2023 · Dear team, We configured App Gateway with WAF in front of the APIM. I have verified that the backend pools in the Application Gateway are correctly mapped to the ingress of the pods. Comment Use comments to ask for clarification, additional information, or improvements to the question. In ~2 seconds I got the expected result. Recently I started experiencing a problem where if I refresh a page a number of times, eventually I get the cloudflare 502 p Apr 18, 2024 · Hi there, I have a web app deployed on Azure App Service which is hosting a Django application. I would also take a look at your startup code to see if you are writing to disk anywhere during configuration or app. Windows. I chose Linux + Node LTS environment. HTTP "502 Bad Gateway" and "503 Service Unavailable" are common errors that you can get when you open an app that you host in Azure App Service. Sometimes functions app gets down and started throwing 503/502 and after restarting 2-3 times it starts working. Jan 20, 2024 · 502 Bad Gateway is an HTTP status code that signifies that the server received an invalid response from the upstream server. 0. To mitigate we have tried restarting and re-deploying one of the affected services but we are still seeing intermittent 502s being reported to the Function users. The most common causes for this behavior are: Requests taking a long time to execute. After updating all the packages and making sure it runs locally, I deplo Dec 17, 2020 · Within the Web App Down page in Diagnose and Solve for my Azure App Service I am seeing a series of 502 errors that have been occurring consistently for the past few hours. Aug 23, 2024 · An Azure service that provides a platform-managed, scalable, and highly available application delivery controller as a service. Could you please advise what we should double-check to address this error? Thanks very much! Apr 15, 2025 · Get answers to frequently asked questions about availability, performance, and application issues in Azure App Service. This might be the case if you are using AAD in any capacity. Everything is working fine with manual test un Oct 5, 2017 · If you get 502:s and even lack application insights log entries Sanity check: Have you deployed your application? Mar 1, 2021 · Cause/Resolution: APIM services forwards a 502 Bad Gateway response to the client in case of Backend Connection Failures. Forms. Use case is pretty simple, serving as a simple load balancer / waf / dmz for an application that lives on some RHEL VM’s. To mitigate this: Split apps across multiple App Service Plans to distribute the load. Max request time is… Jun 24, 2020 · You may follow this article Troubleshoot HTTP errors of "502 bad gateway" and "503 service unavailable" in Azure App Service to identify the issue, Also, make sure there is no network connection broken on your side. netcore 3. scm. I configured deployment source to a local Git repo May 19, 2017 · I’ve recently been playing with the Application Gateway in Azure. Troubleshoot error: Azure Functions Runtime is unreachable May 2, 2025 · Learn how to troubleshoot intermittent connection errors and related performance issues in Azure App Service. Jan 11, 2019 · Need help! I am trying to create a Logic App in Azure (Windows PaaS app service) that would connect to AWS cloud environment (SFTP Linux VM) and get files from there. You can also hit up the KUDU console by targetting https://sitename. To troubleshoot, reduce your dev cycle time and isolate the issue. Overloading a plan can cause performance degradation and intermittent failures. It seems your App Service Plan hosts more than 25 apps, which is not recommended. Mar 4, 2025 · Azure App Service is a service used to create and deploy scalable, mission-critical web apps. When SNAT ports are exhausted, the Azure API Management service might not process client requests timely, causing these errors. I have deployed this on my azure web app which previously had plan B1 where I used to get 502 issues. Jun 8, 2016 · I have same case but using Azure Portal. Aug 31, 2021 · Azure App Service is a service used to create and deploy scalable, mission-critical web apps. but I Jul 8, 2025 · Learn how to troubleshoot Application Gateway Server Error: 502 - Web server received an invalid response while acting as a gateway or proxy server. NET 8 ASP. So I would check the Quotas section within your App Service Plan. When hit the first time, application gateway initiate the health probe, reckon the second time you hit the service, the app gateway has removed the server from the pool hence immediately returning a 502. This can be caused by Azure delays, network issues, or deployment conflicts. My integration tests running from docker container are calling some app service endpoints one by one and sometimes receive 500 or 502 error. TO fix Ignored the build directory. Aug 14, 2024 · We have been experiencing persistent HTTP 502 status code errors from two of our App Services since 18 August 2024. Dec 8, 2021 · I have an Azure Function HTTP trigger listening to Twilio webhooks. Jun 11, 2020 · I have a . There is a problem with the page you are looking for, and it cannot be displayed. Hi @Luis Azevedo The 502 errors you're experiencing may stem from various factors, especially since your app code isn't being directly accessed. It is returning intermittent 502 errors to Twilio at a fairly high rate of 6% (out Jun 24, 2020 · Azure App Service is a service used to create and deploy scalable, mission-critical web apps. htm web page hosted on a VM backend by using the public IP address of the VM. Dec 9, 2022 · At one of my clients we experienced a similar issue with intermittent 502 responses when using Application Gateway v2 with an AKS cluster backend running it own ingress controler (nginx or haproxy, so no AGIC). Resolve 502 Bad Gateway issues on Microsoft Azure with Application Gateway V2, ensuring smooth app performance and minimizing downtime. Sep 17, 2023 · Troubleshoot 502 Bad Gateway and 503 Service Unavailable errors in your app hosted in Azure App Service. status:… Aug 18, 2025 · Troubleshoot 502 Bad Gateway and 503 Service Unavailable errors in your app hosted in Azure App Service. Discover I have a Azure Function app with a HTTP trigger endpoint that intermittently returns 502 errors. Other things to note are: The Logic App reports the time taken as 7m - 8m whereas the portal is just about 1m. Log statements may not work in those cases. Nov 20, 2023 · I have started the migration of our Azure Functions from . Upvoting indicates when questions and answers are useful. However since last few hours we are getting error -Failed to load resource: the server Nov 17, 2020 · I have an app service (plan B2) running on Azure. Resolution: Login to Azure Portal Go to your App Service Select your App Service Name Select TLS/SSL Settings Click Binding Under TLS/SSL Bindings, click the hostname Under Private Certificate Thumbprint, select non-expired cert and save and test your application. Networking- The Application Gateway and App Service are in a hub-and-spoke virtual network topology. For longer processing times, use Azure Durable Functions async pattern. “502 Service Temporarily Overloaded” means the server is overwhelmed. Below are the steps I followed to create required setup howeve Jun 13, 2025 · You're encountering intermittent 502 Bad Gateway and ECONNRESET errors while using the Azure Cognitive Services Text-to-Speech (TTS) API, which can be especially frustrating when you're trying to build a proof-of-concept. 13760. This can happen for a variety of reasons, but it generally means that your NGINX server is acting as a proxy and cannot get a proper response from the backend servers. Nov 28, 2023 · Dear team, We configured App Gateway with WAF in front of the APIM. Oct 23, 2021 · To debug this issue, refer this azure-app-service-troubleshoot-http-502-http-503 MSFT documentation and follow the troubleshooting steps provided. If the web app still does not work, you can try to re-deploy it. I run diagnostic insights and probe health check. Jul 14, 2017 · Immediately after I started that test I went and tested in locally. Oct 14, 2025 · HTTP "502 Bad Gateway" and "503 Service Unavailable" are common errors that you can get when you open an app that you host in Azure App Service. What's reputation and how do I get it? Instead, you can save this post to reference later. Sep 25, 2023 · An Azure service that provides a platform-managed, scalable, and highly available application delivery controller as a service. Dec 11, 2023 · For application running on Azure App Service, sometimes the code throwing error to connect to target service due to connectivity issue. service: azure-application-gateway ms. they showed no issue. May 26, 2023 · Scale the App: In Azure App Service, for increased performance and throughput, you can adjust the scale at which you are running your application. net . Dec 7, 2022 · Describe the bug Azure App Gateway -> Kubernetes hosted[ YARP (As Cluster Reverse-Proxy + Ingress) -> Other kube services ] Here is a general overview of the infra, I just removed some names of act Mar 26, 2019 · 14 I think 503 could mean that you reached a quota and Azure now respond with a 503 for requests. Occasionally when first posting a request I receive a 502 bad gateway response, this happens roughly one in every 2000 requests. I understand that you would like to know what is the best way to troubleshoot 504, 502 & 4xx errors in Azure Application Gateway. In deploy step, it was able to download artifacts, but when deploying on Azure App Services, it either returned 502 Bad Oct 26, 2020 · The Kudu site should definitely be up, even in a failed deployment. Apr 18, 2024 · I have a web app deployed on Azure App Service which is hosting a Django application. Max request time is… Mar 30, 2022 · 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 I've set up an application gateway and connected the web app to it. We are getting 502 Bad Gateway exceptions when invoking the App Gateway. This article is an overview of the resource health feature for Azure Application Gateway May 1, 2016 · Try adding Application Insights to the app. To identify the issue, Sep 4, 2020 · I am hosting my website on azure and using cloudflare for dns and proxy. Max request time is… Jan 23, 2023 · An Azure service that provides a platform-managed, scalable, and highly available application delivery controller as a service. azurewebsites. NET 8, and since then, I've been getting intermittent 502 errors with my HTTP-triggered functions. HTTP“502 错误的网关”和“503 服务不可用”是打开 Azure 应用服务 中托管的应用时可以获取的常见错误。 本文帮助你排查这些错误。 如果需要更多帮助，可以联系 Azure 社区支持 部门中的 Azure 专家。 或者，可以在 Azure 支持站点 上使用资源。 这些错误的原因通常是应用程序级问题，例如： 请求耗费 Jun 28, 2024 · I recently deployed code that worked on my local machine to an Azure App Service and started getting 502 - Bad Gateway responses. May 19, 2023 · Troubleshoot 502 Bad Gateway and 503 Service Unavailable errors in your app hosted in Azure App Service. Logs don't provide anything useful. Jun 23, 2022 · Hi, I have an azure function runtime version 1 that is returning 502 Bad Gateway errors after running for sometime. This has happened 8/7/19, 9/16/19, 9/17/19, and 9/20/19. Feb 13, 2025 · Troubleshoot intermittent time-outs or server issues that occur when you try to access an application that's hosted on an Azure Kubernetes Service (AKS) cluster. 6 days ago · Additionally, the instability and frequent 502/503 errors could be due to resource constraints. I've also configured a DNS zone to direct to the app gateway. Jan 9, 2023 · As we are using Azure Static Web App for hosting our react application. Also check: Troubleshoot HTTP errors of "502 bad gateway" and "503 service unavailable" in Azure App Service Sep 24, 2025 · In this article, you learn how to troubleshoot some of the common problems that you might face for your Azure Front Door instance. topic: troubleshooting ms. Our application, built on . One possible cause is SNAT port exhaustion, which can result in intermittent 5xx errors, including 502 errors. Jan 3, 2024 · Front Door and CDN profile / Azure Front Door Standard I have successfully added a domain to an endpoint and associated it with a route and origin group. Nov 18, 2023 · I just updated my Azure Functions project to . [!INCLUDE updated-for-az] Jun 10, 2021 · I have a Azure Function app with a HTTP trigger endpoint that intermittently returns 502 errors. This may happen due to the following main reasons - Aug 23, 2024 · An Azure service that provides a platform-managed, scalable, and highly available application delivery controller as a service. And both is using port 80 to communicate. Feb 1, 2023 · Hello @Raghava Sai Akula , Apologies for the delay in response. I also got the expected result from the Azure portal but it just took much longer to process. Hope this helps. Sep 15, 2022 · Azure App Service is a service used to create and deploy scalable, mission-critical web apps. When you deploy code that use such libraries, you may get 502 responses. 1 Azure Function on azure functions runtime version 3. net mvc framework to upload videos directly into blob storage. Hence, the troubleshooting and debugging remain the same as the Backend Connection Failures section documented above and is dependent on the details observed under the “ErrorMessage” column in the diagnostic logs. --- title: Troubleshoot Bad Gateway errors - Azure Application Gateway description: 'Learn how to troubleshoot Application Gateway Server Error: 502 - Web server received an invalid response while acting as a gateway or proxy server. I didn't use the word "intermittently" because it is always on the same type of call but now always with the same data. This article helps you troubleshoot these errors. Jan 11, 2023 · I have developed a web app by using . I've not been able to see anyting in the Application Insights logs that would point to the endpoint Jan 13, 2022 · azure azure-active-directory azure-web-app-service single-sign-on http-status-code-502 edited Jan 13, 2022 at 13:02 asked Jan 13, 2022 at 10:43 DevSoftUK Feb 2, 2023 · 502 Bad Gateway Microsoft-Azure-Application-Gateway/v2 We are making sure that we are able to access the simple . Jun 9, 2023 · Azure App Service is a service used to create and deploy scalable, mission-critical web apps. Nov 25, 2019 · I created a simple web app (serverless) and deployed the web app using Azure App Service VS Code extension. Mar 6, 2023 · Our Azure Fuction has started to return 502 Bad Gateways but not on all calls. Application crashing due to an exception. NET 8 Isolated. Occasionally when first posting a request I receive a 502 bad gateway response, this happens roughly one in every 2000 requests I have a Azure Function app with a HTTP trigger endpoint that intermittently returns 502 errors. Jun 5, 2019 · We have a azure function app (App service plan) in which multiple http triggers are present. 0 using a consumption plan. [!INCLUDE updated-for-az] Jul 19, 2022 · Client requests For a SignalR persistent connection, it first /negotiate to your hosted app server and then redirected to the Azure SignalR service and then establishes the real persistent connection to Azure SignalR service. author: mbender ms. Watching the log stream, I've discovered that the 50 May 9, 2024 · An Azure service that provides a platform-managed, scalable, and highly available application delivery controller as a service. ' services: application-gateway author: mbender-ms ms. Jun 10, 2021 · I have a Azure Function app with a HTTP trigger endpoint that intermittently returns 502 errors. In my case, the offending code was using System. Jun 28, 2024 · I recently deployed code that worked on my local machine to an Azure App Service and started getting 502 - Bad Gateway responses. Apr 12, 2024 · However, when I attempt to access the service via the private IP of the Application Gateway, I encounter a 502 error, suggesting that the Application Gateway is unable to communicate with AKS. custom Apr 25, 2024 · Since about 2 weeks we are getting intermittent 502's from two of our Azure Functions. Application using high memory/CPU. The probe indicates it's in good health, and when conducting diagnostic insights, it also reports no detected issues. Jul 3, 2021 · I have 1 application gateway which having 2 backends (Azure VM) which is hosting ASP CORE REST API with IIS. Aug 18, 2025 · Troubleshoot 502 Bad Gateway and 503 Service Unavailable errors in your app hosted in Azure App Service. Jun 24, 2020 · You may follow this article Troubleshoot HTTP errors of "502 bad gateway" and "503 service unavailable" in Azure App Service to identify the issue, Also, make sure there is no network connection broken on your side. EDIT: After working through this with Microsoft Support, the consensus seems to be that this was caused by a faulty worker. The AF is sitting on a premium service plan. date: 04/29/2025 ms. In this video, learn how the rich capabilities of Azure App Service Diagnostic enables you to easily self-diagnose and self-troubleshoot your app hosted on the Azure App Service Platform. Subsequent clicks of the Run button in the Azure portal give me <1s execution times. Sep 10, 2025 · An Azure service that provides a platform-managed, scalable, and highly available application delivery controller as a service. Aug 2, 2017 · I have setup Application Service environment and trying to access WebApps inside App service environment through Application gateway. May 27, 2021 · Azure App Service is a service used to create and deploy scalable, mission-critical web apps. Below are the steps I followed to create required setup howeve Jun 23, 2022 · Hi, I have an azure function runtime version 1 that is returning 502 Bad Gateway errors after running for sometime. NET 7 Isolated (running OK for several months) to . Mar 23, 2020 · test application and it works for few request (not sure how many but once it's starts failing it doesn't work at all). We are unable to track it to any code changes (one service hasn't been re-deployed in over a month). I've followed the app gateway setup as outlined in the documentation. Jul 8, 2025 · Request time-out or connectivity issues with user requests-Azure application Gateway V1 SKU sent HTTP 502 errors if the backend response time exceeds the time-out value that is configured in the Backend Setting. Dec 29, 2023 · Hi, I'm currently facing this issue with my Azure Container App (ACA): When the ACA receives at the same time 4 or more requests and if the app has been "Scaled to 0", some requests return status 503 while others complete just fine. start. Aug 4, 2022 · An Azure service that provides a cloud content delivery network with threat protection. You will be able to 本文描述了 Azure 应用程序网关返回特定 HTTP 响应代码的原因。 其中提供了常见原因和故障排除步骤，以帮助你确定错误 HTTP 响应代码的根本原因。 无论是否启动了与后端目标的连接，都可以将 HTTP 响应代码返回给客户端请求。 Jun 9, 2021 · 502 error for HTTPS when integrate Application Gateway and APIM self-hosted gateway Sep 2, 2023 · The closest thing I could find similar to this is Azure function app intermittently returning 502 Bad Gateway, but that cause doesn't seem to apply here. If you go to your Web App management blade in the Azure Portal and navigate to "Process Explorer", do you see the scm site is running? You could perhaps kill the scm process there and it should reboot. You should see errors on startup of your application. Max request time is… Jul 19, 2022 · How to resolve HTTPS POST failure, BAD Gateway 502, Azure Logic App SharePoint Online Steve Wedge 31 Jul 19, 2022, 2:45 AM Sep 11, 2025 · Backend- A private Azure App Service, integrated via a private endpoint, hosts the application. Refer this MS Doc. To Run App Gateway in its simplest configuration, you just have to; – Create the vnet – Create a subnet for the App Gateway (something like a /27 Azure App Service is a service used to create and deploy scalable, mission-critical web apps. Intermittently, when sending GET to the bot token controller in order to retrieve a token to open the bot, result 502 (Bad Gateway) occurs. Refer to Internals of Azure SignalR Service for the detailed steps. Raw #Troubleshooting bad gateway errors in Application Gateway ##Overview After configuring an Azure Application Gateway, one of the errors which users may encounter is "Server Error: 502 - Web server received an invalid response while acting as a gateway or proxy server". Yesterday my users started reporting intermittent 502 errors when using the app. To start with, you can check the backend health of the Application gateway and see if you are receiving any unhealthy health status and what is the message specified for same in the details section May 27, 2024 · Reproduction: Azure App Service instance, Free tier, shared infrastructure Location: East Asia Operating System: Linux Host . status:… Hi there, I have a web app deployed on Azure App Service which is hosting a Django application. NET Web API project, configured deployment with Github Actions Issues: Build step passed successfully and was able to upload artifacts. I know that this part of the process works because when I add an App Services origin type to the… Jan 30, 2025 · A 502 error occurs when the App Service is temporarily unavailable or not responding. Apr 8, 2025 · An Azure service that provides a platform-managed, scalable, and highly available application delivery controller as a service. Max request time is… Troubleshoot intermittent time-outs or server issues that occur when you try to access an application that's hosted on an Azure Kubernetes Service (AKS) cluster. Nov 17, 2020 · I have an app service (plan B2) running on Azure. I am not sure what could be the reason. Jun 28, 2024 · There are some libraries that Azure App Services don't support. I've not been able to see anyting in the Application Insights logs that would point to the endpoint exceeding the 430 second limit. Other Oct 23, 2024 · Encountering 5XX errors in Azure services? Read on to focus on how design challenges in workflows can lead to 5XX response codes and the steps to mitigate them. Learn how to troubleshoot bad gateway (502) errors received when using Azure Application Gateway. skyet qbay yoyxuup ewpaqc lmcu tcbzdw vlon chnlug wvrbq rqxra mlzp ohdp rrzo dybpuy myxhnke