All the iFolder users must be logged out of the iFolder server before it is upgraded. The users can log in again after the upgrade is complete.
When iFolder 2.x server is configured on NetWare 6.5 SP 6 cluster, migrating from one node to another might fail if a user is logged in using an iFolder Linux client.
Log out all the iFolder 2.x users before migration or bring the resource offline and then migrate it to another node.