What role does the IIS application pool play in SSRS 503 errors, and how can I troubleshoot it?

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Grade: Education Subject: Support
What role does the IIS application pool play in SSRS 503 errors, and how can I troubleshoot it?
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The IIS application pool hosting the Report Server Web Service is crucial. A 503 error can occur if the application pool is recycled frequently, crashes, or is configured with insufficient resources (memory limits, CPU limits). Troubleshooting involves checking the application pool's event logs, ensuring it's not set to recycle too often, and increasing its resource allocation if necessary. Also, verify the application pool identity has the correct permissions.