How do I fix HTTP Error 503 the service is unavailable in IIS?

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Tags

1. #right
2. #start
3. #stopped
4. #unavailable
5. #service
6. #error
7. #application
8. #status
9. #click
10. #restart
11. #starting
12. #caused
13. #issue
14. #check
15. #resolve
16. #would
17. #running
18. #defaultapppool