The HTTP 503 error falls under the 5xx server error group of HTTP status codes. They usually indicate that the web page or resource request is understood by the server, but the latter cannot fill it for one reason or another.

HTTP Error 503 The Service is Unavailable Fixed in Windows 11 and Windows 10

http error 503,
http error 503 the service is unavailable,
error 503,
application pool stopped working,
application pool stopped,
the service is unavailable,
apppool stopped,
restart application pool,
error 503 service unavailable,
503 service unavailable

Windows 11 tips
Windows 10 tips
Fix error

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