'fatal: unable to connect to github.com' message when build the Dockerfile

[molnaredom]

Console log

root@zumabox:~/docker-netsniff# docker build -t trafgen-docker .
Sending build context to Docker daemon  4.608kB
Step 1/16 : FROM alpine:3.15 as builder
 ---> 02e0d6fdf486
Step 2/16 : WORKDIR /workspace
 ---> Using cache
 ---> a9ce4a58511c
Step 3/16 : RUN apk add --no-cache --update         linux-headers         alpine-sdk         coreutils         bash         git         flex         bison
 ---> Using cache
 ---> bc3faec85fc2
Step 4/16 : RUN git clone git://github.com/netsniff-ng/netsniff-ng.git
 ---> Running in edcf59b0656a
Cloning into 'netsniff-ng'...
fatal: unable to connect to github.com:
github.com[0: 140.82.121.4]: errno=Operation timed out

The command '/bin/sh -c git clone git://github.com/netsniff-ng/netsniff-ng.git' returned a non-zero code: 128

Solution

https://stackoverflow.com/questions/16298986/unable-to-connect-to-github-com-for-cloning

• Change the Dockerfile:
  • Replace the RUN git clone git://github.com/netsniff-ng/netsniff-ng.git with RUN git clone http://github.com/netsniff-ng/netsniff-ng.git if you face with the same problem.