title: Nexus refusing to download artifacts?
body: <p>I'm trying to integrate the Atlassian Clover plugin to work with my existing Maven 3 project. I'm also using Nexus 2.6.3. e.g.</p>
  
  <pre><code>mvn clover2:setup test clover2:aggregate clover2:clover
  </code></pre>
  
  <p>produces the error:</p>
  
  <pre><code>[ERROR] Failed to execute goal com.atlassian.maven.plugins:maven-clover2-plugin:3.2.0:instrumentInternal (default-cli) on project hpcmom: Execution default-cli of goal com.atlassian.maven.plugins:maven-clover2-plugin:3.2.0:instrumentInternal failed: Plugin com.atlassian.maven.plugins:maven-clover2-plugin:3.2.0 or one of its dependencies could not be resolved: The following artifacts could not be resolved: org.apache.ant:ant:jar:1.8.4, com.cenqua.clover:clover:jar:3.2.0: Could not find artifact org.apache.ant:ant:jar:1.8.4 in nexus (http://olympus:8081/nexus/content/groups/public) -&gt; [Help 1]
  </code></pre>
  
  <p>And this is not true, I can see and download manually the supposedly missing artifacts <code>org.apache.ant:ant:jar:1.8.4</code> correctly in Central and even from the Remote repository tab view I can also find the needed artifacts. </p>
  
  <p>My build also results in the following errors:</p>
  
  <pre><code>Downloading: http://olympus:8081/nexus/content/groups/public/org/codehaus/plexus/plexus-compiler-api/2.2/plexus-compiler-api-2.2.pom
  [WARNING] The POM for org.codehaus.plexus:plexus-compiler-api:jar:2.2 is missing, no dependency information available
  Downloading: http://olympus:8081/nexus/content/groups/public/org/apache/ant/ant/1.8.4/ant-1.8.4.pom
  [WARNING] The POM for org.apache.ant:ant:jar:1.8.4 is missing, no dependency information available
  Downloading: http://olympus:8081/nexus/content/groups/public/org/apache/ant/ant-launcher/1.8.4/ant-launcher-1.8.4.pom
  [WARNING] The POM for org.apache.ant:ant-launcher:jar:1.8.4 is missing, no dependency information available
  Downloading: http://olympus:8081/nexus/content/groups/public/org/apache/maven/reporting/maven-reporting-impl/2.0.5/maven-reporting-impl-2.0.5.pom
  [WARNING] The POM for org.apache.maven.reporting:maven-reporting-impl:jar:2.0.5 is missing, no dependency information available
  Downloading: http://olympus:8081/nexus/content/groups/public/com/cenqua/clover/clover/3.2.0/clover-3.2.0.pom
  [WARNING] The POM for com.cenqua.clover:clover:jar:3.2.0 is missing, no dependency information available
  Downloading: http://olympus:8081/nexus/content/groups/public/com/intellij/annotations/9.0.4/annotations-9.0.4.pom
  [WARNING] The POM for com.intellij:annotations:jar:9.0.4 is missing, no dependency information available
  Downloading: http://olympus:8081/nexus/content/groups/public/org/apache/ant/ant/1.8.4/ant-1.8.4.jar
  Downloading: http://olympus:8081/nexus/content/groups/public/com/cenqua/clover/clover/3.2.0/clover-3.2.0.jar
  </code></pre>