这当然是您的连接问题:您正在使用的代理和 RStudio 中配置的存储库.当我从印度连接到美国 VPN 时，我遇到了同样的错误.我断开了 VPN 并重新启动了 RStudio，它就像一个魅力！

This certainly is an issue with your connection:the proxies you are using and repositories configured in your RStudio. I was getting the same error when I was connected to US VPN from India.I disconnected VPN and restarted RStudio and it worked like a charm!