- Log in to Plesk account
- Go to Websites & Domains
- Select website
- Click on Hosting & DNS tab
- Click on Dedicated IIS Application Pool for Website link
Note: If your website is unavailable with this error message (HTTP Error 503. The service is unavailable) then the cause is the website's IIS application pool is stopped. The resolution is start the website's application pool:
- Click on Switch Off
- Click on Switch On