proftp 접속 에러

다음과 같은 에러 메세지가 나오면서 접속이 되지 않습니다.

해결방법을 알려주시면 고맙겠습니다.

*클라이언트프로그램에서

530 must perform authentication before identifying USER

* 서버에서

Connected to 203.234.24.230.
220 203.234.24.230 FTP server (Version 5.60) ready.
334 Using authentication type GSSAPI; ADAT must follow
GSSAPI accepted as authentication type
GSSAPI error major: Miscellaneous failure
GSSAPI error minor: No credentials cache found
GSSAPI error: initializing context
GSSAPI authentication failed
334 Using authentication type KERBEROS_V4; ADAT must follow
KERBEROS_V4 accepted as authentication type
Kerberos V4 krb_mk_req failed: You have no tickets cached
Name (203.234.24.230:work): work
530 Must perform authentication before identifying USER.
Login failed.
Remote system type is UNIX.
Using binary mode to transfer files.