Problems with System.Threading.Tasks.Extensions Dependencies since 2025.1.0

[Bitpainter75]

I have a project with a reference to System.Threading.Tasks.Extensions Version=4.6.3.0. Now when i make a SFTP Download or Upload i get the following errormessage since 2025.1.0:

Die Datei oder Assembly "System.Threading.Tasks.Extensions, Version=4.6.3.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51" oder eine Abhängigkeit davon wurde nicht gefunden. Die gefundene Manifestdefinition der Assembly stimmt nicht mit dem Assemblyverweis überein. (Ausnahme von HRESULT: 0x80131040)
Die Datei oder Assembly "System.Threading.Tasks.Extensions, Version=4.2.0.1, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51" oder eine Abhängigkeit davon wurde nicht gefunden. Die gefundene Manifestdefinition der Assembly stimmt nicht mit dem Assemblyverweis überein. (Ausnahme von HRESULT: 0x80131040)

I found no Solution for this, only a revert to SSH.Net Version 2024.2.0 helps for me. In my project is also a reference to Microsoft.Identity.Client 4.79.2, maybe here is a conflict with ?

[mus65]

You are probably missing an assembly binding redirect for System.Threading.Tasks.Extensions in your application. This should usually be handled automatically by the build system, except if you use a legacy ASP .NET web app, see https://learn.microsoft.com/en-us/dotnet/framework/configure-apps/how-to-enable-and-disable-automatic-binding-redirection

[Bitpainter75]

I have a app.config which contains a binding redirect for System.Threading.Tasks.Extensions for Version=4.6.3.0.

		<dependentAssembly>
			<assemblyIdentity name="System.Threading.Tasks.Extensions" publicKeyToken="cc7b13ffcd2ddd51" culture="neutral" />
			<bindingRedirect oldVersion="0.0.0.0-4.6.3.0" newVersion="4.6.3.0" />
		</dependentAssembly>

in my project is non reference to a Version=4.2.0.1 and this errormessage apears only with the SSH.Net Version 2025.1.0 older Versions are ok

[mus65]

This unlikely to be a problem in SSH.NET itself. The difference between the SSH.NET versions is that 2025.1.0 pulls in System.Threading.Tasks.Extensions 4.5.4 and version 2024.2.0 pulls in System.Threading.Tasks.Extensions 4.5.2, both of which should be handled by the binding redirect. So I don't understand what the issue is or where version 4.2.0.1 is coming from either.

There is something else wrong in your build system. I suggest you get rid of the assembly redirects and set <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects> as explained in https://learn.microsoft.com/en-us/dotnet/framework/configure-apps/how-to-enable-and-disable-automatic-binding-redirection . Or provide a minimal repro for the issue.