title: 'mvn install' does not work & shows error while attempting to download
body: <p>I am using maven 3.0.2 version. </p>
  
  <p><code>mvn --version</code> works fine on command line but when I try 
  <code>mvn install</code> it does not work &amp; shows following error. </p>
  
  <pre><code>Z:\dev\hector rantav&gt;mvn install
  [INFO] Scanning for projects...
  Downloading: http://repo1.maven.org/maven2/junit/junit/3.8.2/junit-3.8.2.jar
  [ERROR] The build could not read 1 project -&gt; [Help 1]
  [ERROR]
  [ERROR]   The project me.prettyprint:hector:0.7.0-24-SNAPSHOT (Z:\dev\hector ran
  tav\pom.xml) has 1 error
  [ERROR]     Unresolveable build extension: Plugin org.apache.maven.scm:maven-scm
  -manager-plexus:1.3 or one of its dependencies could not be resolved: Could not
  transfer artifact junit:junit:jar:3.8.2 from/to central (http://repo1.maven.org/
  maven2): Error transferring file: repo1.maven.org: Unknown host repo1.maven.org
  -&gt; [Help 2]
  [ERROR]
  [ERROR] To see the full stack trace of the errors, re-run Maven with the -e swit
  ch.
  [ERROR] Re-run Maven using the -X switch to enable full debug logging.
  [ERROR]
  [ERROR] For more information about the errors and possible solutions, please rea
  d the following articles:
  [ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/ProjectBuildin
  gException
  [ERROR] [Help 2] http://cwiki.apache.org/confluence/display/MAVEN/PluginResoluti
  onException
  </code></pre>
  
  <p>Please let me how I can fix this.</p>