From DOS windows FTP server login login failed, prompting, and reported to the 530 error code.
Check equipment AAA view on the user FTP operation related configuration.
In this case there are several reasons,
1) to enter the username or password error in
2) planning username password no configuration in the device, in fact equipment in authentication can't find the user.
3) to login using the username does not define the FTP service authority.
4) login using the username defines the FTP service authority but does not define the operation for the FTP service directory.So prompt login incorrect.