دلیل خطای Nuget connection attempt failed Unable to load the service index for source

برای اضافه کردن Identity در بخش scaffolding به مشکل خوردم و خطای Nuget می دهد.

این پیغام رو میده و این آدرس رو مینویسه.

Nuget connection attempt failed “Unable to load the service index for source”

[nuget.org] Unable to load the service index for source https://api.nuget.org/v3/index.json. An error occurred while sending the request. Unable to connect to the remote server A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond 68.232.34.200:443