Network Management

SolarWinds Platform Web Console fails to load with “Could not load file or assembly 'Infragistics.Web.Documents.Excel,... The system cannot find the file specified.” error

This article discusses an issue when SolarWinds Platform Website failed during initialization because the ASP.NET runtime could not locate required Infragistics assemblies referenced in web.config. This causes the site to stop loading entirely and generates a configuration parser error.

First published date

11/14/2025 1:39 PM

Last published date

11/14/2025 4:28 PM

Overview

When accessing the SolarWinds Platform Web Console, the page fails to load and displays a Server Error in '/' Application → Configuration Error.

 

The error indicates that required Infragistics DLL files used for Excel export and UI rendering are missing from the web directory. 

Product section

Orion Platform

Cause

The required Infragistics library is missing from the system. SolarWinds uses Infragistics for Excel export functionality (NCM, Reports, etc.).

Here are the files missing under VolumePath:\Solarwinds\Orion\Web\*:

Resolution

Performing a Platform repair rebuilds missing components, restores DLLs, and re-registers all web and service dependencies.

Before proceeding with the steps below, ensure that HA is disabled.

  1. Disable or delete HA pools, force a failover, or update an HA pool for SolarWinds Platform products 
  2. Create a backup of the environment (Database and SolarWinds Server)
  3. Log in to the SolarWinds server as an Administrator
  4. Start > Run > appwiz.cpl
  5. Right-click SolarWinds Platform, and select Repair
    • After the repair, the Configuration Wizard is launched
  6. Complete the Configuration Wizard to complete the repair process
  7. Relaunch the Web Console.