Brew Update Error with Git

Question

I am running into an issue with running both rvm use ruby --install --default and brew update. It appears the later issue is the reason why I am seeing the first issue.

Here is the error for rvm use ruby --install --default:

ruby-2.1.2 is not installed - installing.
Searching for binary rubies, this might take some time.

Found remote file https://rvm.io/binaries/osx/10.9/x86_64/ruby-2.1.2.tar.bz2
Checking requirements for osx.
Installing requirements for osx.
Updating system......
Error running 'requirements_osx_brew_update_system ruby-2.1.2',
showing last 15 lines of /Users/connorphillips/.rvm/log/1408816616_ruby-2.1.2/update_system.log
    https://github.com/Homebrew/homebrew/wiki/Common-Issues
and make sure `brew update` works before continuing.'
++ rvm_pretty_print stderr
++ case "${rvm_pretty_print_flag:=auto}" in
++ case "${TERM:-dumb}" in
++ case "$1" in
++ [[ -t 2 ]]
++ return 1
++ printf %b 'Failed to update Homebrew, follow instructions here:
    https://github.com/Homebrew/homebrew/wiki/Common-Issues
and make sure `brew update` works before continuing.\n'
Failed to update Homebrew, follow instructions here:
    https://github.com/Homebrew/homebrew/wiki/Common-Issues
and make sure `brew update` works before continuing.
++ return 1
Requirements installation failed with status: 1.
Gemset '' does not exist, 'rvm ruby-2.1.2 do rvm gemset create ' first, or append '--create'.

I then try brew update and this is the error I'm seeing:

fatal: unable to access 'https://github.com/Homebrew/homebrew.git/': Could not resolve host: github.com
Error: Failure while executing: git pull -q origin refs/heads/master:refs/remotes/origin/master

What is the source of the issue/fix it.

Answer 1

It might be a problem with Git. Just try to do this on a terminal:

git config --global --unset http.proxy 

git config --global --unset https.proxy 

and restart your terminal or open a new one. Then try brew update again.

Answer 2

I had a similar issue but was able to resolve it. Every time I tried to run brew update I'd get this error:

fatal: unable to access 'https://github.com/Homebrew/homebrew.git/': Could not resolve host: github.com
Error: Failure while executing: git pull --quiet origin refs/heads/master:refs/remotes/origin/master

My issue was that I was using a VPN, but after turning it off it worked for me.