Check your enviroment:
echo $http_proxy
echo $https_proxy
echo $HTTPS_PROXY
echo $HTTP_PROXY
and delete with export http_proxy=
Or check https and http proxy
git config --global --unset https.proxy
git config --global --unset http.proxy
Or do you have the proxy in the local config?
git config --unset http.proxy
git config --unset https.proxy