Plesk shows HTTP Error 503. The service is unavailable: A listener channel for protocol 'http' in worker process serving application pool 'PleskControlPanel' reported a listener channel failure

Created:

2016-11-16 12:52:04 UTC

Modified:

2017-08-16 16:11:04 UTC

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Plesk shows HTTP Error 503. The service is unavailable: A listener channel for protocol 'http' in worker process serving application pool 'PleskControlPanel' reported a listener channel failure

Applicable to:

  • Plesk 11.x for Windows
  • Plesk 12.0 for Windows
  • Plesk 12.5 for Windows

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:

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