node.js - npm install bower fails -

i trying install bower on mac os yosemite npm fails following message

npm err! fetch failed http://registry.npmjs.org/nopt/-/nopt-3.0.3.tgz npm warn retry retry, error on last attempt: error: connect etimedout npm err! fetch failed http://registry.npmjs.org/request/-/request-2.53.0.tgz npm warn retry retry, error on last attempt: error: connect etimedout npm err! fetch failed http://registry.npmjs.org/shell-quote/-/shell-quote-1.4.3.tgz npm warn retry retry, error on last attempt: error: connect etimedout npm err! darwin 14.4.0 npm err! argv "node" "/usr/local/bin/npm" "install" "-g" "bower" npm err! node v0.12.7 npm err! npm  v2.12.1 npm err! code etimedout npm err! errno etimedout npm err! syscall connect  npm err! network connect etimedout npm err! network not problem npm npm err! network , related network connectivity. npm err! network in cases behind proxy or have bad network settings. npm err! network npm err! network if behind proxy, please make sure npm err! network 'proxy' config set properly.  see: 'npm config'  npm err! please include following file support request: npm err!     /users/larris/npm-debug.log 

i have installed other packages npm

   /usr/local/lib ├── cordova@5.1.1 ├── gulp@3.9.0 ├── ionic@1.6.1 ├── npm@2.12.1 └── yo@1.4.7 

but when try install bower above error. not behind firewall , npm config is

; cli configs user-agent = "npm/2.12.1 node/v0.12.7 darwin x64"  ; userconfig /users/larris/.npmrc registry = "http://registry.npmjs.org/" strict-ssl = false  ; builtin config undefined prefix = "/usr/local"  ; node bin location = /usr/local/bin/node ; cwd = /users/larris ; home = /users/larris ; 'npm config ls -l' show defaults.