How can I fix this problem in Ubuntu 20.04?

[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

I don't have a problem with this $ docker pull on CentOS 7.

Here are the proxy I have used in ~/.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."

Added these in config.json but the error still persist after logout:

$ 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."

   }

 }

}

I get:

[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)