I am sorry for the lack of specifics, you are correct, the problem appears to be in the OpenSSH SFTP server. Profiles belonging to the Administrator group are authenticated, all others fail. By generic user profile, I mean one that is not a member of the Administrator group. I realize that this is not a WinSCP issue, I was hoping others might have already run across this problem and have a solution. The issue seems to be with the SSHD_Config file that is shipped with this feature on Windows Server 2019. I followed the instructions on the WinSCP website to set up an SFTP server, which had me install the OpenSSH feature, but the instructions do not address any possible changes to the default SSHD_config file. Adjusting the AllowUsers and AllowGroups entries in this file do not seem to have the effect I would expect. Has anyone successfully implemented an OpenSSH SFTP server on Windows Server 2019 that will authenticate non-Administrator profiles? The specific error in the SSHD.log shows
"Windows authentication failed for user: FTPUSER.local domain: (null) error: 1329"
The user logging in is gal.ftpuser, gal is our local domain. The testing is being done within the domain.