"mensaje no se pudo obtener del registro" al intentar instalar cualquier módulo

No puedo instalar ningún módulo de nodo desde el npm.

npm install socket.io

El comando anterior resultó en la salida inferior, no es capaz de instalar socket.io

npm http GET https://registry.npmjs.org/socket.io

npm ERR! Error: failed to fetch from registry: socket.io
npm ERR!     at /opt/node0610/lib/node_modules/npm/lib/utils/npm-registry-client/get.js:139:12
npm ERR!     at cb (/opt/node0610/lib/node_modules/npm/lib/utils/npm-registry-client/request.js:32:9)
npm ERR!     at Request._callback (/opt/node0610/lib/node_modules/npm/lib/utils/npm-registry-client/request.js:137:18)
npm ERR!     at Request.callback (/opt/node0610/lib/node_modules/npm/node_modules/request/main.js:109:22)
npm ERR!     at Request.<anonymous> (/opt/node0610/lib/node_modules/npm/node_modules/request/main.js:198:58)
npm ERR!     at Request.emit (events.js:88:20)
npm ERR!     at ClientRequest.<anonymous> (/opt/node0610/lib/node_modules/npm/node_modules/request/main.js:195:10)
npm ERR!     at ClientRequest.emit (events.js:67:17)
npm ERR!     at CleartextStream.<anonymous> (http.js:1134:11)
npm ERR!     at CleartextStream.emit (events.js:67:17)
npm ERR! You may report this log at:
npm ERR!     <http://github.com/isaacs/npm/issues>
npm ERR! or email it to:
npm ERR!     <[email protected]>
npm ERR! 
npm ERR! System Linux 2.6.18-194.el5
npm ERR! command "node" "/opt/node0610/bin/npm" "install" "socket.io"
npm ERR! cwd /opt/node0610/lib/node_modules
npm ERR! node -v v0.6.10
npm ERR! npm -v 1.1.0-3
npm ERR! message failed to fetch from registry: socket.io
npm ERR! 
npm ERR! Additional logging details can be found in:
npm ERR!     /opt/node0610/lib/node_modules/npm-debug.log
npm not ok

Mi versión NPM es:

[applmgr@dev node_modules]$ npm --version
1.1.0-3

Mi versión de NodeJS es:

[applmgr@dev node_modules]$ node --version
v0.6.10