Classic and integrated pipeline mode
Posibility to change classic and integrated pipeline mode in IIS7/7.5/8/8.5 on Plesk Panel (ASP.NET Settings)
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Can be changed in IIS Application Pool settings of your subscription in Plesk Onyx 17.8 (“Managed pipeline mode” drop-down menu)
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Anonymous
    
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  Go to plesk > Websites & Domains > IIS Application Pool > Dedicated IIS Application Pool for Website ... and here you can change it .