How do I troubleshoot 503 errors caused by dependent services failing in IIS?

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Grade: Education Subject: Support
How do I troubleshoot 503 errors caused by dependent services failing in IIS?
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Identify any services your application relies on (e.g., database server, caching service). Check their status and event logs. Ensure these services are running and accessible. Network connectivity issues between IIS and these services can also trigger 503 errors.