node.js, npm ERR! Error: failed to fetch from registry

При установке модуля socket.io для node.js, с помощью стандартной команды

npm install socket.io

получаю ошибку

npm http GET https://registry.npmjs.org/socket.io
npm ERR! Error: failed to fetch from registry: socket.io
npm ERR!     at /usr/share/npm/lib/utils/npm-registry-client/get.js:139:12
npm ERR!     at cb (/usr/share/npm/lib/utils/npm-registry-client/request.js:31:9)
npm ERR!     at Request._callback (/usr/share/npm/lib/utils/npm-registry-client/request.js:136:18)
npm ERR!     at Request.callback (/usr/lib/nodejs/request/main.js:119:22)
npm ERR!     at Request.<anonymous> (/usr/lib/nodejs/request/main.js:212:58)
npm ERR!     at Request.emit (events.js:88:20)
npm ERR!     at ClientRequest.<anonymous> (/usr/lib/nodejs/request/main.js:412:12)
npm ERR!     at ClientRequest.emit (events.js:67:17)
npm ERR!     at HTTPParser.onIncoming (http.js:1261:11)
npm ERR!     at HTTPParser.onHeadersComplete (http.js:102:31)
npm not ok

решение, изменить протокол с https на http

npm config set registry http://registry.npmjs.org/

 или выключить строгий режим для ssl

npm config set strict-ssl false