Node.js NPM获取失败

这里有一个简单的例子：

npm install socket.io

npm http GET https://registry.npmjs.org/socket.io
npm http 304 https://registry.npmjs.org/socket.io
npm http GET https://registry.npmjs.org/-/socket.io-0.9.10.tgz
npm http 404 https://registry.npmjs.org/-/socket.io-0.9.10.tgz
npm ERR! fetch failed https://registry.npmjs.org/-/socket.io-0.9.10.tgz
npm ERR! Error: 404 Not Found
npm ERR!     at null.<anonymous> (/usr/local/lib/node_modules/npm/lib/utils/fetch.js:47:16)
npm ERR!     at EventEmitter.emit (events.js:115:20)
npm ERR!     at WriteStream.flush (fs.js:1514:12)
npm ERR!     at fs.close (/usr/local/lib/node_modules/npm/node_modules/graceful-fs/graceful-fs.js:92:5)
npm ERR!     at Object.oncomplete (fs.js:297:15)
npm ERR! If you need help, you may report this log at:
npm ERR!     <http://github.com/isaacs/npm/issues>
npm ERR! or email it to:
npm ERR!     <npm-@googlegroups.com>

npm ERR! System Darwin 11.4.0
npm ERR! command "node" "/usr/local/bin/npm" "install" "socket.io"
npm ERR! cwd /Users/enrico/Documents/MMORPG
npm ERR! node -v v0.8.6
npm ERR! npm -v 1.1.48
npm ERR! 
npm ERR! Additional logging details can be found in:
npm ERR!     /Users/enrico/Documents/MMORPG/npm-debug.log
npm ERR! not ok code 0

npm安装socket.io
npm http GEThttps://registry.npmjs.org/socket.io
npm http 304https://registry.npmjs.org/socket.io
npm http GEThttps://registry.npmjs.org/-/socket.io-0.9.10.tgz
npm http 404https://registry.npmjs.org/-/socket.io-0.9.10.tgz
npm错误！提取失败https://registry.npmjs.org/-/socket.io-0.9.10.tgz
npm错误！错误：找不到404
npm错误！在空。（/usr/local/lib/node_modules/npm/lib/utils/fetch.js:47:16）
npm错误！在EventEmitter.emit（events.js:115:20）
npm错误！在WriteStream.flush（fs.js:1514:12）
npm错误！在fs.close（/usr/local/lib/node_modules/npm/node_modules/graceful fs/graceful fs.js:92:5）
npm错误！在Object.oncomplete（fs.js:297:15）
npm错误！如果需要帮助，您可以在以下位置报告此日志：
npm错误！
npm错误！或通过电子邮件发送至：
npm错误！
npm错误！达尔文11.4.0系统
npm错误！命令“node”“/usr/local/bin/npm”“install”“socket.io”
npm错误！cwd/Users/enrico/Documents/MMORPG
npm错误！节点-v v0.8.6
npm错误！npm-V1.1.48
npm错误！
npm错误！其他日志记录详细信息可在以下位置找到：
npm错误/Users/enrico/Documents/MMORPG/npm-debug.log
npm错误！不正常代码0

此npm安装有什么问题？服务器是否无法访问？有解决办法吗

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提前谢谢

你可以把我算在内。我尝试npm更新了大约2个小时，直到我脑子里的铃声告诉我用谷歌搜索这个问题。真伤心。。似乎私有注册表像海绵一样被挤压。似乎注册表打开了太多文件句柄，无法处理更多请求。嘎。。我只想安装emailjs