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+---
+title: Troubleshooting Your Application
+modified_at: 2025-12-31 00:00:00
+tags: troubleshooting errors crash deployment
+index: 15
+---
+
+This page provides a summary of common issues you might encounter while deploying or running your application on Scalingo, along with links to more detailed guides.
+
+## Deployment Issues
+
+Deployment issues usually happen during the build phase, before your application is even started.
+
+* **Unknown Technology**: Occurs when Scalingo cannot detect the programming language or framework of your application.
+* **Image Too Large**: Your application image exceeds the 1.5 GiB limit.
+* **Archive Too Large**: The source code archive (uncompressed) exceeds the 300 MB limit.
+
+For more details on how to fix these, see our [Common Deployment Errors]({% post_url platform/getting-started/2000-01-01-common-deployment-errors %}) page.
+
+## Boot and Startup Errors
+
+These errors occur when the platform tries to start your application's containers.
+
+* **Start Errors**: Generic errors during the startup process, often due to misconfiguration.
+* **Timeout Errors**: Your application failed to bind to the assigned `PORT` within 60 seconds.
+* **Hook Errors**: Failure of a `postdeploy` hook script.
+
+Detailed information and fixes can be found in the [Application Crash]({% post_url platform/app/2000-01-01-crash %}#understanding-boot-errors) documentation.
+
+## Runtime Issues
+
+Runtime issues happen while your application is already running.
+
+* **Application Crashes**: Unexpected termination of your application process.
+* **5xx Errors**: Server-side errors that might be related to application crashes or timeouts.
+
+Learn how to diagnose and recover from these in the [Application Crash]({% post_url platform/app/2000-01-01-crash %}#understanding-runtime-errors) section.
+
+## Other Common Problems
+
+* **SSH Connectivity**: Issues when trying to access your containers via SSH or pushing code. See [Troubleshooting SSH]({% post_url platform/getting-started/2000-01-01-troubleshooting-ssh %}).
+* **Custom Error Pages**: If you want to customize the 502, 503, or 504 error pages displayed to your users, refer to [Custom Error and Maintenance Pages]({% post_url platform/app/2000-01-01-custom-error-page %}).