The TeamForge SCM Integration server runs an instance of Tomcat and then launches TeamForge inside the Tomcat container.
If you are experiencing issues creating or altering repositories or adding and removing users from repository access, and the other TeamForge integration logs are not providing any clues, you may wish to review the Tomcat log at: /opt/collabnet/teamforge/log/integration/catalina.out
Sometimes, OS-level errors will be flagged into this log and not others. In our experience, it is pretty rare to find something in this log that is not logged elsewhere.