FTP
331 Username OK, Need Password
User name okay, need password. The server recognized the username and is waiting for the corresponding password to complete authentication.
当您看到此代码时
After sending the USER command with a valid username. The server is prompting for the PASS command.
如何修复
Send the PASS command with the correct password. If you get 530 after PASS, the password is wrong — verify your credentials.