docker：来自守护进程的错误响应：获取 https://registry-1.docker.io/v2/：net/http：请求在等待连接时取消

如何在 Ubuntu 20.04 中解决此问题？

[18:31:29] (dpcc) jalal@echo:~/research/code$ sudo docker pull docurdt/heal
[sudo] password for jalal: 
Using default tag: latest
Error response from daemon: Get https://registry-1.docker.io/v2/: net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers)


$ uname -a
Linux echo 5.4.0-99-generic #112-Ubuntu SMP Thu Feb 3 13:50:55 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux


$ docker --version
Docker version 20.10.7, build 20.10.7-0ubuntu5~20.04.2

我对 CentOS 7 上的这个 $ docker pull 没有问题。

这是我使用的代理~/.bashrc：

export http_proxy="http://webproxy.bu.edu:8900"
export https_proxy="http://webproxy.bu.edu:8900"
export ftp_proxy="http://webproxy.bu.edu:8900"
export rsync_proxy=$http_proxy
export no_proxy="localhost,127.0.0.1,.bu.edu,.ad.bu.edu,128.197.,10."

添加了这些，config.json但注销后错误仍然存​​在：

$ cat ~/.docker/config.json 
{
 "proxies":
 {
   "default":
   {
     "httpProxy": "http://webproxy.bu.edu:8900",
     "httpsProxy": "http://webproxy.bu.edu:8900",
     "noProxy": "localhost,127.0.0.1,.bu.edu,.ad.bu.edu,128.197.,10."
   }
 }
}

我得到：

[19:38:02] jalal@echo:~/research/code$ docker pull docurdt/heal
Using default tag: latest
Error response from daemon: Get https://registry-1.docker.io/v2/: net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers)