Docker: Error Response from Daemon: Get Https: //Registry-1. Docker. Io/V2/: Net/Http: Request Canceled While Waiting for Connection

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  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=""
export https_proxy=""
export ftp_proxy=""
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": "",
     "httpsProxy": "",
     "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  net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers)