I'm running the latest plugin agains Redmine 2.3.0.
When browsing the changelog, it leads to "repositories/entry/" + projectName + filePath (https://github.com/jenkinsci/redmine-plugin/blob/master/src/main/java/hudson/plugins/redmine/RedmineRepositoryBrowser.java, line 49)
However, the format in Redmine is: /redmine/projects/<projectName>/repository/entry/<filePath>
Same thing with the revision views: In the plugin is "repositories/revision/" + projectName + "/" + changeSet.getRevision()
but in Redmine is different.