If you've configured your Maven settings.xml to list the Nexus public group as a mirror for all repositories, you might encounter projects which are unable to retrieve artifacts from your local Nexus installation. This usually happens because you are trying to build a project which has defined a custom set of repositories and snapshotRepositories in a pom.xml. When you encounter a project which contains a custom repository element in a pom.xml add this repository to Nexus as a new proxy repository and then add the new proxy repository to the public group.