The REINITIALIZE i5/OS® FTP client subcommand restarts a session on a remote system.
REInitialize
If the FTP server supports the REINITIALIZE subcommand, the USER session with the FTP server is ended. The FTP server is in the same state as when the connection is re-established, and the user needs to log on again to continue.
Any file transfers already in progress can complete before the USER session ends.