exit code of #128 fatal: unable to connect to github.com

I follow the Quickstart guide from FoundationPress and it display this error

bower install && grunt build
bower foundation#*          not-cached git://github.com/zurb/bower-foundation.git#*
bower foundation#*             resolve git://github.com/zurb/bower-foundation.git#*
bower fontawesome#~4.3.0    not-cached git://github.com/FortAwesome/Font-Awesome.git#~4.3.0
bower fontawesome#~4.3.0       resolve git://github.com/FortAwesome/Font-Awesome.git#~4.3.0
bower fontawesome#~4.3.0       ECMDERR Failed to execute "git ls-remote --tags --heads git://github.com/FortAwesome/Font-Awesome.git", exit code of #128 fatal: unable to connect to github.com: github.com[0:]: errno=Connection timed out

I run this to solve this problem.

git config --global url."https://".insteadOf git://

libpng error: IDAT: CRC error

I receive this error message while using wkhtmltoimage.

In Mac, it it not allow you to use Preview to save to other format.
It will display cannot write, or enable to save.

The fastest way to solve this problem, can be done in Automator, you can use Photo -> Flip Image -> Flip Image then save or convert to other format.

Then your PNG error will be gone.