gFTP的问题

gestapo

220 Serv-U FTP Server v6.0 for WinSock ready...
USER  test

331 User name okay, need password.
PASS xxxx
230 User logged in, proceed.
SYST

215 UNIX Type: L8
TYPE I

200 Type set to I.
PWD

257 "/" is current directory.
PASV

错误：无法读套接字：Connection reset by peer
正在断开与站点 abc123456.vicp.net 的连接

服务器是Serv-U FTP Server v6.0为什么连接不上