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'502 bad gateway' and '503 service unavailable' are common errors in your app hosted in Azure App Service. This article helps you troubleshoot these errors.
'502 bad gateway' and '503 service unavailable' are common errors in your app hosted in Azure App Service. This article helps you troubleshoot these errors. If you need more help at any point in this article, you can contact the Azure experts on the MSDN Azure and the Stack Overflow forums.
If you need more help at any point in this article, you can contact the Azure experts on the MSDN Azure and the Stack Overflow forums. Alternatively, you can also file an Azure support incident. Go to the Azure Support site and click on Get Support.
Symptom
When you browse to the app, it returns a HTTP '502 Bad Gateway' error or a HTTP '503 Service Unavailable' error.
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Cause
This problem is often caused by application level issues, such as:
- requests taking a long time
- application using high memory/CPU
- application crashing due to an exception.
Troubleshooting steps to solve '502 bad gateway' and '503 service unavailable' errors
Troubleshooting can be divided into three distinct tasks, in sequential order:
App Service gives you various options at each step.
1. Observe and monitor application behavior
Track Service health
Microsoft Azure publicizes each time there is a service interruption or performance degradation. You can track the health of the service on the Azure Portal. For more information, see Track service health.
Monitor your app
This option enables you to find out if your application is having any issues. In your app’s blade, click the Requests and errors tile. The Metric blade will show you all the metrics you can add.
Some of the metrics that you might want to monitor for your app are
- Average memory working set
- Average response time
- CPU time
- Memory working set
- Requests
For more information, see:
2. Collect data
Use the diagnostics tool
App Service provides an intelligent and interactive experience to help you troubleshoot your app with no configuration required. When you do run into issues with your app, the diagnostics tool will point out what’s wrong to guide you to the right information to more easily and quickly troubleshoot and resolve the issue.
To access App Service diagnostics, navigate to your App Service app or App Service Environment in the Azure portal. In the left navigation, click on Diagnose and solve problems.
Use the Kudu Debug Console
App Service comes with a debug console that you can use for debugging, exploring, uploading files, as well as JSON endpoints for getting information about your environment. This is called the Kudu Console or the SCM Dashboard for your app.
You can access this dashboard by going to the link https://<Your app name>.scm.azurewebsites.net/.
Some of the things that Kudu provides are:
- environment settings for your application
- log stream
- diagnostic dump
- debug console in which you can run Powershell cmdlets and basic DOS commands.
Another useful feature of Kudu is that, in case your application is throwing first-chance exceptions, you can use Kudu and the SysInternals tool Procdump to create memory dumps. These memory dumps are snapshots of the process and can often help you troubleshoot more complicated issues with your app.
For more information on features available in Kudu, seeAzure Websites online tools you should know about.
3. Mitigate the issue
Scale the app
In Azure App Service, for increased performance and throughput, you can adjust the scale at which you are running your application. 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.
For more information on scaling, see Scale an app in Azure App Service.
Additionally, you can choose to run your application on more than one instance . This not only provides you with more processing capability, but also gives you some amount of fault tolerance. If the process goes down on one instance, the other instance will still continue serving requests.
You can set the scaling to be Manual or Automatic.
Use AutoHeal
AutoHeal recycles the worker process for your app based on settings you choose (like configuration changes, requests, memory-based limits, or the time needed to execute a request). Most of the time, recycle the process is the fastest way to recover from a problem. Though you can always restart the app from directly within the Azure Portal, AutoHeal will do it automatically for you. All you need to do is add some triggers in the root web.config for your app. Note that these settings would work in the same way even if your application is not a .NET one.
For more information, see Auto-Healing Azure Web Sites.
Restart the app
This is often the simplest way to recover from one-time issues. On the Azure Portal, on your app’s blade, you have the options to stop or restart your app.
You can also manage your app using Azure Powershell. For more information, seeUsing Azure PowerShell with Azure Resource Manager.
How to fix 502 Bad Gateway Error: This error occurs because the server which acting as gateway or proxy tried to access the main server in order to fulfill the request has received an invalid or no response at all. Sometimes empty or incomplete headers caused by broken connections or server side issues can cause Error 502 Bad Gateway when accessed via a gateway or proxy.
According to the RFC 7231, 502 Bad Gateway is an HTTP status code defined as
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The 502 (Bad Gateway) status code indicates that the server, while acting as a gateway or proxy, received an invalid response from an inbound server it accessed while attempting to fulfill the request.
Different types of 502 Bad Gateway error you might see:
- 502 Bad Gateway
- HTTP Error 502 – Bad Gateway
- 502 Service Temporarily Overloaded
- Error 502
- 502 Proxy Error
- HTTP 502
- 502 Bad Gateway NGINX
- Twitter over capacity is actually a 502 Bad Gateway error
- Windows Update fails due to 502 error displays WU_E_PT_HTTP_STATUS_BAD_GATEWAY
- Google displays Server error or just 502
You have no control over 502 error as they are server side but sometimes your browser is tricked into displaying it, so there are few troubleshooting steps which you might try in order to fix the issue.
How to fix 502 Bad Gateway Error
Make sure to create a restore point just in case something goes wrong.
Method 1: Reload the Web Page
If you’re not able to visit a particular web page because of 502 Bad Gateway Error then do wait for few minutes before again trying to access the website. A simple reload after waiting for a minute or so can fix this issue without any problem.Use Ctrl + F5 to reload the web page as it bypasses the cache and again check if the issue is resolved or not.
If the above step didn’t help then it might be a great idea to close everything you’re working on and restart your browser. Then again the same website which was giving you 502 Bad Gateway Error and see if you were able to fix the error if not then continue to the next method.
Method 2: Try another browser
It might be possible that there are some issues with your current browser so it’s always a good idea to try another browser to visit the same web page again. If the issue is resolved then you have to re-install your browser in order to resolve the error permanently but if you are still facing the 502 Bad Gateway Error then it’s not a browser related issue.
Method 3: Clear Browser’s Cache
1.Open Google Chrome and press Cntrl + H to open history.
2.Next, click Clear browsing data from the left panel.
3.Make sure the “beginning of time” is selected under Obliterate the following items from.
4.Also, check mark the following:
- Browsing history
- Download history
- Cookies and other sire and plugin data
- Cached images and files
- Autofill form data
- Passwords
5.Now click Clear browsing data and wait for it to finish.
6.Close your browser and restart your PC.
Method 4: Start your Browser in Safe Mode
Neopets 502 Bad Gateway 2
Windows Safe Mode is a different thing don’t confuse with it and don’t start your Windows in safe mode.
1.Make a shortcut of Chrome icon on the desktop and right-click then select properties.
2.Select the Target field and type “–incognito” at the end of the command.
3.Click Apply followed by OK and then try to open your Browser with this shortcut.
4.Now try to visit the website and see if you’re able to fix 502 Bad Gateway Error.
Method 5: Disable Unnecessary Extensions
If you’re able to fix your issue via above method then you need to disable unnecessary extensions in order to resolve the issue permanently.
Neopets 502 Bad Gateway Cloudflare
1.Open Chrome and then navigate to settings.
2.Next, select Extension from the left-hand side menu.
3.Make sure to disable and delete all the unnecessary Extensions.
4.Restart your Browser and the error may have gone away.
Method 6: Disable Proxy
1.Press Windows Key + R then type “inetcpl.cpl” and hit enter to open Internet Properties.
2.Next, Go to Connections tab and select LAN settings.
3.Uncheck Use a Proxy Server for your LAN and make sure “Automatically detect settings” is checked.
4.Click Ok then Apply and reboot your PC.
Method 7: Change DNS Settings
1.Open Control Panel and click on Network and Internet.
2.Next, click Network and Sharing Center then click on Change adapter settings.
3.Select your Wi-Fi then double click on it and select Properties.
4.Now select Internet Protocol Version 4 (TCP/IPv4) and click Properties.
5.Check mark “Use the following DNS server addresses” and type the following:
Preferred DNS server: 8.8.8.8
Alternate DNS server: 8.8.4.4
6.Close everything and you may be able to Fix 502 Bad Gateway Error.
Method 8: Flush DNS and Reset TCP/IP
1.Right-click on Windows Button and select “Command Prompt(Admin).“
2.Now type the following command and press enter after each one:
(a) ipconfig /release
(b) ipconfig /flushdns
(c) ipconfig /renew
3.Again open Admin Command Prompt and type the following and hit enter after each one:
- ipconfig /flushdns
- nbtstat –r
- netsh int ip reset
- netsh winsock reset
4.Reboot to apply changes. Flushing DNS seems to Fix 502 Bad Gateway Error.
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That’s it you have successfully fix 502 Bad Gateway Error but if you still have any queries regarding this article then please feel free to ask them in the comment’s section.