I am trying to test reactjs on my computer (mbp pro 2017) running OsX sierra 10.12.6. 
I have followed the Facebook tutorial:

1. Make sure you have a recent version of Node.js installed. *(done)*
2. Follow the installation instructions to **create a new project**. <https://facebook.github.io/react/docs/installation.html#creating-a-new-application>

But i have a problem on this second step !

* I am not behind a proxy.
* my network is ok.
* The repository is set to registry.npmjs.org
* i can read the url : <https://registry.npmjs.org/create-react-app>
* But this domain is not found even on external DNS **wsg.intra.corp.grp**

I'am stuck, any help will be nice !

```
$ npm install -g create-react-app
npm ERR! code ENOTFOUND
npm ERR! errno ENOTFOUND
npm ERR! network request to https://registry.npmjs.org/create-react-app failed, reason: getaddrinfo ENOTFOUND wsg.intra.corp.grp wsg.intra.corp.grp:8080
npm ERR! network This is a problem related to network connectivity.
npm ERR! network In most cases you are behind a proxy or have bad network settings.
npm ERR! network 
npm ERR! network If you are behind a proxy, please make sure that the
npm ERR! network 'proxy' config is set properly.  See: 'npm help config'

npm ERR! A complete log of this run can be found in:
npm ERR!     ~/.npm/_logs/2017-09-01T08_15_13_521Z-debug.log

```

And the log file :

```
0 info it worked if it ends with ok
1 verbose cli [ '/usr/local/bin/node',
1 verbose cli   '/usr/local/bin/npm',
1 verbose cli   'install',
1 verbose cli   '-g',
1 verbose cli   'create-react-app' ]
2 info using npm@5.3.0
3 info using node@v8.4.0
4 verbose npm-session 4811d091ad74f9ef
5 silly install loadCurrentTree
6 silly install readGlobalPackageData
7 silly fetchPackageMetaData error for create-react-app@latest request to https://registry.npmjs.org/create-react-app failed, reason: getaddrinfo ENOTFOUND wsg.intra.corp.grp wsg.intra.corp.grp:8080
8 verbose type system
9 verbose stack FetchError: request to https://registry.npmjs.org/create-react-app failed, reason: getaddrinfo ENOTFOUND wsg.intra.corp.grp wsg.intra.corp.grp:8080
9 verbose stack     at ClientRequest.req.on.err (/usr/local/lib/node_modules/npm/node_modules/pacote/node_modules/make-fetch-happen/node_modules/node-fetch-npm/src/index.js:68:14)
9 verbose stack     at emitOne (events.js:115:13)
9 verbose stack     at ClientRequest.emit (events.js:210:7)
9 verbose stack     at onerror (/usr/local/lib/node_modules/npm/node_modules/pacote/node_modules/make-fetch-happen/node_modules/https-proxy-agent/node_modules/agent-base/index.js:106:9)
9 verbose stack     at callbackError (/usr/local/lib/node_modules/npm/node_modules/pacote/node_modules/make-fetch-happen/node_modules/https-proxy-agent/node_modules/agent-base/index.js:126:5)
9 verbose stack     at <anonymous>
9 verbose stack     at process._tickCallback (internal/process/next_tick.js:188:7)
10 verbose cwd /Users/franckfournier/PycharmProjects/projectX/react
11 verbose Darwin 16.7.0
12 verbose argv "/usr/local/bin/node" "/usr/local/bin/npm" "install" "-g" "create-react-app"
13 verbose node v8.4.0
14 verbose npm  v5.3.0
15 error code ENOTFOUND
16 error errno ENOTFOUND
17 error network request to https://registry.npmjs.org/create-react-app failed, reason: getaddrinfo ENOTFOUND wsg.intra.corp.grp wsg.intra.corp.grp:8080
18 error network This is a problem related to network connectivity.
18 error network In most cases you are behind a proxy or have bad network settings.
18 error network
18 error network If you are behind a proxy, please make sure that the
18 error network 'proxy' config is set properly.  See: 'npm help config'
19 verbose exit [ 1, true ]

```