SFTP cannot log in

I use SFTP in QNAP NAS, when I log in it tips “A supplied user name not accepted by the server”,but when I use WinSCP it works correct. I want to know why?

Hi~ @ji.cai ,

We are distributing a night build that solves the issue you mentioned. Download it, check it out, and let us know the result.

The problem has been solved.