If you connect Vault with an AEM 6.1 Forms J2EE instance, it fails with the following error:
Connecting via JCR remoting to http://<server>:<port>/lc
[WARN ] Authentication required to access repository descriptors
[ERROR] checkout: com.day.jcr.vault.vlt.VltException: Unable to mount filesystem
caused by: javax.jcr.RepositoryException: OK
caused by: org.apache.jackrabbit.webdav.DavException: OK