Wing FTP Software

HI All,

I have seen multiple logs for denied on sftp domain, How we can restrict traffic flow on ftp server

02] Tue, 17 Apr 2018 00:08:01 (4561772) Failed to exchange the keys.
[02] Tue, 17 Apr 2018 00:08:01 (4561772) Closed session, disconnected from DMZ IP
[02] Tue, 17 Apr 2018 00:10:25 (4561783) Connected from DMZ2 IP (local address Listen IP, port 22)
[02] Tue, 17 Apr 2018 00:10:25 (4561783) Failed to exchange the keys.
[02] Tue, 17 Apr 2018 00:10:26 (4561783) Closed session, disconnected from DMZ2 IP
[02] Tue, 17 Apr 2018 00:11:01 (4561786) Connected from DMZ IP (local address Listen IP, port 22)
[02] Tue, 17 Apr 2018 00:11:01 (4561786) Failed to exchange the keys.
[02] Tue, 17 Apr 2018 00:11:01 (4561786) Closed session, disconnected from DMZ IP

From your server logs, it seems SFTP connection failed on the ssh key exchanging. If you are using an old SFTP client software, please have a look at this KB article first: https://bbs.wftpserver.com/viewtopic.php?t=3547