Installing yii2 via composer and it keeps asking for password

I am just following instructions from yii site and don't understand composer. I followed instructions from here http://www.yiiframework.com/doc-2.0/guide-start-installation.html

Authentication seems to work, but then it prompts for username / password over and over again.

Does anyone have some things I can check to see why it keeps prompting?

[root@dndbox html]# composer create-project --prefer-dist --stability=dev yiisoft/yii2-app-basic basic
Installing yiisoft/yii2-app-basic (dev-master b528289495bf9721d2b8c628d69caad42e45b0ce)
  - Installing yiisoft/yii2-app-basic (dev-master master)
    Downloading: connection...
Could not fetch https://api.github.com/repos/yiisoft/yii2-app-basic/zipball/b528289495bf9721d2b8c628d69caad42e45b0ce, enter your GitHub credentials to go over the API rate limit
The credentials will be swapped for an OAuth token stored in /root/auth.json, your password will not be stored
To revoke access to this token you can visit https://github.com/settings/applications
Username: *.com
Password: 
An existing OAuth token for Composer is present and will be reused

Could not fetch https://api.github.com/authorizations, enter your GitHub credentials to go over the API rate limit
The credentials will be swapped for an OAuth token stored in /root/auth.json, your password will not be stored
To revoke access to this token you can visit https://github.com/settings/applications
Username: *.com
Password: 
An existing OAuth token for Composer is present and will be reused

Could not fetch https://api.github.com/authorizations, enter your GitHub credentials to go over the API rate limit
The credentials will be swapped for an OAuth token stored in /root/auth.json, your password will not be stored
To revoke access to this token you can visit https://github.com/settings/applications
Username: 

      

        
        
        
      

    

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If I find the url I get an error in json, https://api.github.com/authorizations

{
  "message": "API rate limit exceeded for xxx.xxx.xxx.26. (But here the good news: Authenticated requests get a higher rate limit. Check out the documentation for more details.)",
  "documentation_url": "https://developer.github.com/v3/#rate-limiting"
}