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Veeam ONE Web Client Page Fails to Load After Updating .NET Runtime Components

KB ID: 4545
Product: Veeam ONE | 11 | 12 | 12.1
Published: 2024-01-30
Last Modified: 2024-05-02
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.NET Version Requirements

Veeam ONE build 12.1.0.3208 requires and supports only .NET 6.0. All three component versions must match.

  • ASP.NET Core Runtime 6.0.x
    Microsoft ASP.NET Core 6.0.x - Shared Framework (x64)
  • .NET Desktop Runtime 6.0.x
    Microsoft Windows Desktop Runtime - 6.0.x (x64)
  • .NET Runtime 6.0.x
    Microsoft .NET Runtime - 6.0.x (x64)

For example. removing 6.x .NET components and installing 7.x or 8.x .NET components will cause the Veeam ONE services to fail to start.

Challenge

After updating .NET Runtime components, the Veeam ONE Web Client page fails to load with either of the following errors:

Error Failed to connect to Veeam ONE Server
This page isn't working
<server> is currently unable to handle this request.
HTTP ERROR 500
Failed to connect
Error 500

Cause

These issues may occur after .NET runtime components have been updated, either because the Veeam ONE Reporting Service has not been restarted or because the Veeam ONE Reporting Service is stopped and cannot be started because not all .NET runtime component versions match.

Solution

Check Installed .NET Runtimes

Use the following command to check which versions of the .net runtime components are installed:

dotnet --list-runtimes

Matching .NET Runtime Versions

If all .NET Runtime components are the same version, as shown in the example below, restart the Veeam ONE Reporting Service. The issue should then be resolved. If not, create a case with Veeam Technical Support.

Match
Example of matching .net runtime components.

Mismatched .NET Runtime Versions

If .NET Runtime components are running different versions, update the older ones so all versions match. Then start the Veeam ONE Reporting Service. The issue should then be resolved. If not, create a case with Veeam Technical Support.

mismatched runtime versions
Example of mismatched .net runtime components.
In the mismatched version example above, the solution is to install version 6.0.26 of .NET Desktop Runtime and .NET Runtime to match the ASP.NET Core Runtime version.
Name in Add/Remove Programs Name on .NET Website dotnet Command Name
Microsoft ASP.NET Core - Shared Framework ASP.NET Core Runtime Microsoft.AspNetCore.App
Microsoft Windows Desktop Runtime .NET Desktop Runtime Microsoft.WindowsDesktop.App
Microsoft .NET Runtime .NET Runtime Microsoft.NETCore.App
Swipe to show more of the table
When .NET runtime components are mismatched, Event 1023 will appear in the Event Viewer's Application log. The Event Properties will describe what components need to be updated and provide a download link to the version required.
Event Log
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