Hi @c-schuette_7781 ,
This error is occurring on the remote server (i.e. nuget.devexpress.com). This error can happen when a server is overloaded... so you're basically doing a DoS on DevExpress's server. You'll need to try again or contact DevExpress for help,.
I believe that DevExpress wrote their own, custom NuGet server. We've had several issues with it in the past. While talking to them, you should also suggest they switch to ProGet ISV Edition like some other component vendors
Best,
Steve