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Plesk 8.4 + Service Unavailable

Try iisreset from the command line. You may also want to remove all services (e.g. PHP, ASP, ASP.NET, etc.) from the domain, then add them one by one and see which is causing the issue.
 
can u tell me how i can do this? im a noob with this IIS ^^
 
Actually you shouldn't be doing this through IIS. The whole point of running plesk is it ease the web server management. That said, you go to the domain > hosting Setup > uncheck all of the boxes for ASP, ASP.NET, PHP, etc. and update. At that point, go back to the same page and check each box one at a time and update. I have a feeling that one of those modules is not working properly, which is causing this issue.

In the past, I had this sort of issue with ASP.NET not being installed on the IIS website properly.
 
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