Web console is showing "Server Error in '/Orion' Application" when DB connection is working and all services are running

The Web console is showing "Server Error in '/Orion' Application" when DB connection is working and all services are running. Setting SolarWinds application pool identity 'ApplicationPoolIdentity' to Local System does not resolve the issue.

• Checking the server's Event Viewer > Application Logs will show a warning level ASP.NET exception, Event 1310. Could not load file or assembly 'Infragistics.Web.Documents.Excel. 
  
  

• Additionally, checking OrionWeb logs will show only the following warnings:  
  • 2026-04-15 02:15:45,038 [1] (1) WARN  SolarWinds.Orion.Web.NetObjectFactory - (null)  Net object type "DatabaseFile" with prefix "ABXF" defined in module "APM" does not have a static method called 'GetAllObjects'.
  • 2026-04-15 02:15:45,054 [1] (1) WARN  SolarWinds.Orion.Web.NetObjectFactory - (null)  Net object type "UDTWatchListNetObject" with prefix "UW" defined in module "UDT" does not have a constructor that takes a single string.
  • 2026-04-15 02:15:45,069 [1] (1) WARN  SolarWinds.Orion.Web.NetObjectFactory - (null)  Net object type "PolicyNetObject" with prefix "PEP" defined in module "PolicyEngine" does not have a static method called 'GetAllObjects'.

This indicates the required Infragistics Excel/UI libraries used for export and some UI components are missing from the SolarWinds Platform Web folder, but the assemblies are still referenced in web.config file. This causes ASP.NET to fail during configuration parsing, so the site never starts.

Web Folder Location:
C:\Program Files\SolarWinds\Orion\Web\api2\bin\ja

The required Infragistics Excel/UI libraries used for export and some UI components are missing from the SolarWinds Platform Web folder, but the assemblies are still referenced in web.config. This causes ASP.NET to fail during configuration parsing, so the site never starts.

1. If using HA, temporarily disable HA first.
   Disable/delete HA pools or force failover so the active main server is the one you’re repairing.
2. Take backups.
   • Backup the SolarWinds database.
   • Take a snapshot/backup of the SolarWinds application server. 
3. Rebuild the SolarWinds Website as per:
   • https://solarwindscore.my.site.com/SuccessCenter/s/article/Rebuild-the-Orion-Website?language=en_US
4. Complete the Configuration Wizard when it launches.
   • Let it rebuild the website and services (DB, Services, Website steps).
   • This restores the missing Infragistics DLLs under the Orion web directories and re-registers dependencies. 
5. Relaunch the Web Console and verify.
   • Browse to the Web Console again; the configuration error should be gone and the site should load normally.