Hi guys When do some build on openstack-manuals project,there is error when bulid 'openstack-compute-admin' ,but others (such as openstack-user, docbkx-example e.g) are all SUCCESS. Anybody know why ? Thanks! Cd openstack-manuals/doc/src/docbkx/openstack-compute-admin mvn clean generate-sources [INFO] Scanning for projects... [INFO] [INFO] ------------------------------------------------------------------------ [INFO] Building OpenStack Administration Guides 1.0.0-SNAPSHOT [INFO] ------------------------------------------------------------------------ Downloading: http://maven.research.rackspacecloud.com/content/groups/public/org/apache/maven/plugins/maven-clean-plugin/2.3/maven-clean-plugin-2.3.pom Downloading: http://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-clean-plugin/2.3/maven-clean-plugin-2.3.pom [INFO] ------------------------------------------------------------------------ [INFO] BUILD FAILURE [INFO] ------------------------------------------------------------------------ [INFO] Total time: 2:17.516s [INFO] Finished at: Mon Aug 19 10:56:57 CST 2013 [INFO] Final Memory: 8M/245M [INFO] ------------------------------------------------------------------------ [ERROR] Plugin org.apache.maven.plugins:maven-clean-plugin:2.3 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.apache.maven.plugins:maven-clean-plugin:jar:2.3: Could not transfer artifact org.apache.maven.plugins:maven-clean-plugin:pom:2.3 from/to rackspace-research (http://maven.research.rackspacecloud.com/content/groups/public/): Connection to http://maven.research.rackspacecloud.com refused: Connection timed out -> [Help 1] [ERROR] [ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch. [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 read the following articles: [ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/PluginResolutionException