installing Ionic Framework in node js

I am getting an error when installing Ionic framework in node js. I am behind a proxy but I already set-up my node config to a proper proxy.

Here is the error message:

error network tunneling socket could not be established, cause=read ECONNRESET error network This is most likely not a problem with npm itself error network and is related to network connectivity. error network In most cases you are behind a proxy or have bad network settings. error network error network If you are behind a proxy, please make sure that the error network 'proxy' config is set properly. See: 'npm help confi