$ git push origin master
fatal: unable to access 'https://urlgit/repo.git/': Failed to connect to gitlab.com port 443: Conexión rehusada
$ git config --global http.proxy http://daniel.quisbert:passwordxxx@url.proxy.net:8080
$ git config --global --unset http.proxy
ó
$ git config --global --unset core.gitproxy