id summary reporter owner description type status priority component resolution keywords cc component_version os os_version 12175 Client Intermittently Transferring Files dansmcabe "Client OS: Windows 10 64-Bit Server OS: FreeNAS 11 FileZilla Version: 3.48.0 I connected via FTP to my NAS to transfer around 10,000 files. I observed a series of error messages about a second connection failing after the transfers started, however, I had already initiated the entire folder copy. After being complete, over 2,400 files had not copied due to an unspecified error. So, I tried again. The same number of files failed to transfer. So, I adjusted the number of FTP connections from 2 to 1. Then, all of the files copied successfully. I changed nothing else. I think that this circumstance causes file transfers to fail repeatedly. There is a work-around, as stated." Bug report moreinfo normal FileZilla Client Windows 64-Bit OS Build 18363.815