We have been using software to connect to FTP servers for several years. Recently, we encountered a problem to connect with Serv-U FTP Server v15.1. After checking and searching on google, we found that most users using WinSCP have problems connecting to the mentioned FTP server. If possible, check the issue and provide a suitable solution.
Meanwhile, we were able to connect to Serv-U FTP Server v15.1 with VanDyke software.