vsftp is not working only when i ftp from windows server

Hello Gurus,

Naif is implemented for only for port 21 for few windows servers.
I have made my linux 5.1 as my FTP server.

After installing vsftpd i could ftp from other linux server.
linux to linux (ftp server)

But same when i ftp from other windows server which only port 21 is enabled.
I am geting the error as shown below. Its not even ptompting for password

windows -> linux (ftp server)
220 (vsFTPd 2.0.5)
User (10.80.158.148:(none)): username
530 Please login with USER and PASS.
Login failed.

Note: This i am facing only wen i ftp from windows only

Is ter something firewall is blocking it?

Please advice on it.