问Debian11 apt-get update报错?

在服务器实例Debian系统中,输入 sudo apt-get update命令后,报错,连不上https://download.docker.com

服务器为腾讯云,sources.list文件内容为:

deb http://mirrors.tencentyun.com/debian bullseye main contrib non-free

#deb-src http://mirrors.tencentyun.com/debian bullseye main contrib non-free

deb http://mirrors.tencentyun.com/debian bullseye-updates main contrib non-free

#deb-src http://mirrors.tencentyun.com/debian bullseye-updates main contrib non-free

deb http://mirrors.tencentyun.com/debian-security bullseye-security main contrib non-free

#deb-src http://mirrors.tencentyun.com/debian-security bullseye-security main contrib non-free

#deb http://mirrors.tencentyun.com/debian bullseye-backports main contrib non-free

#deb-src http://mirrors.tencentyun.com/debian bullseye-backports main contrib non-free

#deb http://mirrors.tencentyun.com/debian bullseye-proposed-updates main contrib non-free

#deb-src http://mirrors.tencentyun.com/debian bullseye-proposed-updates main contrib non-free

这是什么原因呢?