title: centos6.8 wget error: Proxy Authentication Required
body: <p>I got following error message when I tried to connect to web site through proxy with <code>wget</code> on centos 6.8.</p>
  
  <p><strong>ERROR</strong></p>
  
  <pre><code>wget http://www.yahoo.co.jp
  --2016-12-16 14:47:04 http://www.yahoo.co.jp
  Connecting to 172.30.10.124:8080... connected.
  Proxy request sent, awaiting response... 407 Proxy Authentication Required
  2016-12-16 14:47:04 ERROR 407: Proxy Authentication Required
  </code></pre>
  
  <p><strong>CHECKED</strong></p>
  
  <p>I confirm this command is running.</p>
  
  <pre><code>export http_proxy='http://guest:gstPass@172.30.10.124:8080'
  wget http://www.yahoo.co.jp
  </code></pre>
  
  <p><strong>~/.wgetrc</strong></p>
  
  <p>This is contents of ~/.wgetrc</p>
  
  <pre><code>http_proxy = 172.30.10.124:8080
  https_proxy = 172.30.10.124:8080
  ftp_proxy = 172.30.10.124:8080
  proxy_user = "guest"
  proxy_passwd = "gstPass"
  (I do not edit /etc/wgetrc)
  </code></pre>
  
  <p><strong>wget version</strong></p>
  
  <p>This is version of <code>wget</code></p>
  
  <pre><code>GNU Wget 1.12 built on linux-gnu
  </code></pre>
  
  <p>I also read <a href="https://stackoverflow.com/questions/31096703/wget-proxy-authentication-error">wget proxy authentication error</a> but no change.</p>
  
  <p>Where should I check? Where are the mistakes?</p>