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IIS HTTP Error 503. The service is unavailable.

How to resolve IIS “HTTP Error 503. The service is unavailable.” error in hosting servers

In our role as Web support specialists, we resolve and prevent service errors in both Linux and Windows servers. Recently we were contacted by a Windows server owner who was getting “HTTP Error 503. The service is unavailable” in his websites.

Upon examining the EventViewer logs, we could see the error “A process serving application pool ‘plesk(default)(4.0)(pool)’ suffered a fatal communication error with the Windows Process Activation Service”. (more…)