On Plesk Obsidian for Windows, installing Plesk updates and creating domains fails: Unable to remove product ‘modsecurity’, String must not be empty

Dmitry Bystrov

12 months ago

Symptoms

Updating Plesk Obsidian for Windows fails:

Error: The installation of the package 'modsecurity' failed with code 1603. (upgrade: Upgrading ModSecurity IIS Module...)
Creating new domains or subdomains in Plesk fails:

Domain example.com creation failed
String must not be empty
.....

ModSecurity modules were manually removed from IIS - they are missing in Internet Information Services (IIS) Manager > server_name > Modules.

Connect to the server using RDP.
Go to Start > Server Manager > Tools > Internet Information Services (IIS) Manager.
Register ModSecurity modules:
- Go to server_name > Modules:
- Click Configure Native Modules > Register:
- Register modules:
  
  name: ModSecurity IIS (32bits)
  path: C:WindowsSystem32inetsrvModSecurityIIS.dll
  
  name: ModSecurity IIS (64bits)
  path: C:WindowsSysWOW64inetsrvModSecurityIIS.dll
Restart IIS by opening CMD as Administrator and executing the command:

iisreset /restart
Complete the update or create a domain/subdomain anew.

Instead of removing ModSecurity modules directly from IIS, ModSecurity can be disabled via Plesk: How to disable ModSecurity in Plesk?

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