How to fix HTTP ERROR 502.

aygunaliyeva 20 Reputation points
2025-10-03T13:11:31.01+00:00

The Azure Web App has been successfully deployed, but it's currently not responding and returns an HTTP ERROR 502.

Azure App Service
Azure App Service

Azure App Service is a service used to create and deploy scalable, mission-critical web apps.

Answer accepted by question author
Anonymous
2025-10-03T13:28:06.0966667+00:00

Hi aygunaliyeva

A 502 Bad Gateway error typically means that the Azure Web App is unable to communicate properly with the backend server or service. Here are a few steps you can take to troubleshoot and resolve it

  • Check App Service Health:
    • Go to the Azure Portal → App Service → Diagnose and solve problems.
    • Look for any issues with the platform or service availability.
  • Review Application Logs:
    • Enable and check application logs (e.g., stdout, stderr) to see if your app is crashing or throwing exceptions.
  • Verify Startup Configuration:
    • Ensure your app starts correctly and listens on the expected port.
    • For Node.js, Python, or custom containers, make sure the startup command is correct.
  • Check Dependencies:
    • If your app relies on external services (e.g., databases, APIs), ensure they are reachable and not causing timeouts.
  • App Settings & Environment Variables:
    • Double-check your configuration in the Azure Portal under “Configuration” → “Application settings”.
  • Use Kudu Console:
    • Access the Kudu console (https://<your-app-name>.scm.azurewebsites.net) to inspect files, logs, and environment variables.

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