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Plesk shows 503 Service Unavailable: iisnode.dll failed to load The data is the error

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Julian Bonpland Mignaquy
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Plesk for Windows kb: technical ABT: Group A

Applicable to:

  • Plesk for Windows

Symptoms

  • When loading Plesk the following error is displayed:

    CONFIG_TEXT: HTTP Error 503. The service is unavailable

  • In Event Viewer > Windows Logs > Application the following error:

    CONFIG_TEXT: The Module DLL C:\\Program Files (x86)\\iisnode\\iisnode.dll failed to load. The data is the error.

  • PleskControlPanel Application pool is stopped at IIS Manager > server > Application Pools

Cause

Plesk users psaadm and psacln do not have access to C:\\Program Files (x86)\\iisnode\\ directory by default.

Resolution

  1. Connect to the server via RDP.

  2. Add the following lines into the disksecurity.xml file which is stored in %plesk_dir%\\etc\\DiskSecurity\\ directory:

    CONFIG_TEXT: <!-- Program Files\\iisnode -->
    <Entry AccounType="1" Account="Psaadm" Path="{ProgramFiles}" SubPath="iisnode" AceFlags="ThisFolderSubfoldersAndFiles" AccessMask="Read" EntryFlags="0x40" />
    <Entry AccounType="1" Account="Psacln" Path="{ProgramFiles}" SubPath="iisnode" AceFlags="ThisFolderSubfoldersAndFiles" AccessMask="Read" EntryFlags="0x40" />

  3. Open Plesk Reconfigurator by running the following command in cmd:

    C:\> "%plesk_dir%admin\bin\reconfigurator.exe"

  4. Correct disk permissions:
    5.png
    OR
    Repair Plesk Installation > tick checkbox Plesk File Security > Check.

    OR

    Set Read permissions for Authenticated Users group on C:\Program Files (x86)\iisnode\iisnode.dll

  5. Start Plesk Services Monitor:
    3.png

  6. Restart Plesk Management Service
    2.png

  7. Start PleskControlPanel application pool at IIS > server > Application Pools > PleskControlPanel > Start

Comments

2 comments

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  • Avatar
    Win admins

    Hi

    Client installed directly through RDP:
    1. node-v12.18.0-x64.msi
    2. iisnode-express-v0.2.21-x86.msi

    Plesk panel application pool crashed and all other websites application pool also crashed.

    Corrected by below steps and also installed Node.js using Plesk.

    "C:\Program Files\iisnode" Deny permission for users psaadm_users,psaadm and psacln, changed to "read and execute".
    "C:\Program Files (x86)\iisnode" Only read permission were found changed to Read and execute.

    Note: permission changes from RDP not from DiskSecurity.xml though had entered same content mentioned in this KB.

    Just want to know how this can be corrected as I have run Plesk reconfigurator for all possible option available.

    how to add both location with correct permission.

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  • Avatar
    Ivan Postnikov

    Hello Win admins

     

    Thank you for sharing your user experience!

    It may be useful for other Pleskians.

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