FTP
350 File Action Pending
Requested file action pending further information. The server has accepted the first part of a two-step command and is waiting for the follow-up.
When You See This Code
After issuing RNFR (rename from) to specify which file to rename. The server is waiting for the RNTO (rename to) command.
How to Fix
Send the follow-up command immediately — typically RNTO after RNFR, or REST followed by RETR for resumed transfers.