PLESK 12 HTTP Error 503. The service is unavailable - SOLUTION


Article ID: 6735, created on Sep 30, 2009, last review on Jul 3, 2015
  • Applies to:
  • Plesk


Upon trying to open Parallels Plesk Panel in your browser you receive the following error: "HTTP Error 503. The service is unavailable."
Parallels Plesk Panel uses IIS as a Web server.
IIS Advanced Logging
 or IIS Mod-Rewrite is installed on the server.
Third-party ISAPI filters are registered in the PleskControlPanel website as shown in the following screenshot:


You can change the "PleskControlPanel" application pool Identity and then try to browse your control panel.

Following are the steps to change the application pool Identity.

Log in your server.

1. Type "inetmgr" in RUN.
2. You will get IIS opened.
3. Click on applicaion pools
4. Right click on "PleskControlPanel" application pool.
5. Advance >> Identity >> change it to 'Local system'

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