Communication error during multiple files transferring using WinSCP

Hello Site Admin

We are using version 5.9.3,and using background file transfer function in SFTP.
I changed my WinSCP client's ‘Maximal number of transfer at the same time’ from 2 to 4,
since when we transfer 3 or more files it have been failed a lot of times.
But it still fails now while 3 files are being transferred at the same time.

We find the message in log "Handling network close event on socket 992 with error 10053"
occurs and transfer Abnormal termination.

So I wonder if the configuration [Maximal number of transfer at the same time] 4 working here?
Also is there any other configuration setting will help us solve this issue?
For example could it will be solved if I upgrade WinSCP version?

Please take a look at the log here for reference.
Thanks.

Thanks for your report.
I have sent you an email with a debug version of WinSCP to the address you have used to register on this forum.

martin wrote:

Thanks for your report.
I have sent you an email with a debug version of WinSCP to the address you have used to register on this forum.

Thanks.I got your message and email.
Can I use the debug version of WinSCP in product environment.We tried to reproduce the problem in test system,but failed.If OK,could I use the debug version in pro-system,until it happens again and get the detail log?

Jia wrote:

Can I use the debug version of WinSCP in product environment.We tried to reproduce the problem in test system,but failed.If OK,could I use the debug version in pro-system,until it happens again and get the detail log?

It's a beta version. Use it with a caution. Though, while it can be less stable, it should not do any damage to your files or a system.