To ensure your Reporting Services is running in a healthy state, you need to check if you have all the green ticks in your "Report Server Configuration Manager".
❌ Figure: Bad example - Reporting Services is not running in a healthy state
✅ Figure: Good example - Reporting Services is configured correctly (on previous versions)
✅ Figure: Good example - Nowadays, Reporting Services does not show green ticks anymore
Note: "Report Server Configuration Manager" is only available in SQL Server 2005.