Website is unavailable: HTTP Error 500.19 - Internal Server Error

Created:

2016-12-12 03:47:26 UTC

Modified:

2017-08-08 13:44:23 UTC

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Website is unavailable: HTTP Error 500.19 - Internal Server Error

Applicable to:

  • Plesk 12.5 for Windows

Symptoms

  1. Unable to access website with the following error message:

    HTTP Error 500.19 - Internal Server Error. The requested page cannot be accessed because the related configuration data for the page is invalid. 
    Detailed Error Information: Module IIS Web Core
    Notification BeginRequest
    Handler Not yet determined
    Error Code 0x80070021
    Config Error Lock violation
    Config File \\\\?\\E:\\vhosts\\example.com\\httpdocs\\web.config
    Requested URL http://example.com:80/
    Physical Path E:\\vhosts\\example.com\\httpdocs
    Logon Method Not yet determined
    Logon User Not yet determined
    Config Source:
    52: <handlers>
    53: <remove name="ExtensionlessUrlHandler-ISAPI-4.0_32bit" />
    54: <remove name="ExtensionlessUrlHandler-ISAPI-4.0_64bit" />
    More Information:
    This error occurs when there is a problem reading the configuration file for the Web server or Web application. In some cases, the event logs may contain more information about what caused this error.
  2. Unable to open website's Handler Mappings in IIS > Site > example.com with the following error message:

    There was an error while performing this operation. Details: Filename: \\\\?\\E:\\vhosts\\example.com\\httpdocs\\web.config Line number: 53 Error: Lock violation

Cause

Web.config file contains records about invalid handlers.

Resolution

  1. Create a backup of website's web.config file. It is located in %plesk_vhosts%\\example.com\\httpdocs folder

  2. Remove lines from original web.config that are mentioned in the error message, lines 53,54 in the example.

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