Building a Custom Robot Driver failed

[xiaosnowqiang]

Hello，guys here i come again. About ten days before i had post a issue both on the github rosmed and Slicer discourse. And thanks Mr.lassoan told me i maybe use the too old version of the tutorial, Ubuntu, and ROS. So i try to find and finally get the latest version on .i follow the steps and when i try to Building a Custom Robot Driver with the below commands

I always get error like ‘fatal: unable to access 'https://github.com/ros-controls/ros2_controllers.git/': Failed to connect to github.com port 443: Connection refused
’
It's been holding me back for days，i have try to fix it but failed. So i here for your guys help,and may be you can also upload the archive containing the virtual machine just like the docker image which will better for the Vm users.
i would thanks you guys for the great work and appreciate for any reply.
Best wishes,
-Jian