When the user copies a file from local to remote, the following error message appears:
Network error: Software caused connection abort
The software attempts to reconnect several more time (4-5 times) then aborts.
The methods replicated were "F5 Copy" button and Drag&Drop.
This issue was demonstrated to me with two files: 45Kb and 815Kb respectively.
Sometimes on closing and restarting the software, the file copy works immediately.
OS: Windows 7 Enterprise 32-bit
WinSCP: 5.1.2 (Build 2816)
Transfer protocol: SFTP
Bandwidth: 10Mbps uncontended connection