"HTTP Error 503. The service is unavailable" when opening Plesk

Refers to:

  • Plesk 11.0 for Windows
  • Plesk 11.5 for Windows
  • Plesk 12.0 for Windows
  • Plesk 12.5 for Windows
  • Plesk 10.x and below for Windows

Created:

2016-11-16 12:52:04 UTC

Modified:

2017-02-19 03:53:18 UTC

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"HTTP Error 503. The service is unavailable" when opening Plesk

Symptoms

Upon trying to open Plesk in your browser you receive the following error:

HTTP Error 503. The service is unavailable.

Plesk 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:

Plesk Default application pool crashes several seconds after restart with an error such as :

Log Name:      System
Source: Microsoft-Windows-WAS
Date: 9/29/2009 1:02:52 PM
Event ID: 5139
Task Category: None
Level: Warning
Keywords: Classic
User: N/A
Computer: Test
Description:
A listener channel for protocol 'http' in worker process '3768' serving application pool 'PleskControlPanel' reported a listener channel failure. The data field contains the error number.

Cause

This is caused by the third-party ISAPI filter configured for the PleskControlPanel website, which cannot run at the same time as the Plesk rewrite filter.

Resolution

Remove third-party ISAPI filters from PleskControlPanel website configuration and keep only the Plesk rewrite filter as shown in the following screenshot:

See also

Where did my IIS7 server go? Troubleshooting 503 "service unavailable" errors by Mike Volodarsky

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