serv-U配置好象有问题老是出502
我用的serv-u7.1.0.2
连接的时候老是到502就一顿但是可以连接上.
下载也是到502就一顿

[右] 已连接到 www.lwceshi.cn
[右] 220 Serv-U FTP Server v7.1 ready...
[右] USER yaxige
[右] 331 User name okay, need password.
[右] PASS (隐藏)
[右] 230 User logged in, proceed.
[右] SYST
[右] 215 UNIX Type: L8
[右] FEAT
[右] 211-Extensions supported
[右] OPTS MODE;MLST;UTF8
[右] CLNT
[右] CSID Name; Version;
[右] HOST domain
[右] SITE PSWD;SET;INDEX;ZONE;CHMOD;MSG;EXEC;HELP
[右] AUTH TLS;SSL;TLS-C;TLS-P;
[右] PBSZ
[右] PROT
[右] CCC
[右] SSCN
[右] RMDA directoryname
[右] DSIZ
[右] AVBL
[右] MODE Z
[右] THMB BMP|JPEG|GIF|TIFF|PNG max_width max_height pathname
[右] REST STREAM
[右] SIZE
[右] MDTM
[右] MDTM YYYYMMDDHHMMSS[+-TZ];filename
[右] XCRC filename;start;end
[右] MLST Type*;Size*;Create;Modify*;Perm;Win32.ea;Win32.dt;Win32.dl
[右] 211 End (for details use "HELP commmand" where command is the command of interest)
[右] CLNT 3.5.2.1215
[右] 200 Noted.
[右] PWD
[右] 257 "/" is current directory.
[右] TYPE A
[右] 200 Type set to A.
[右] MODE Z
[右] 200 MODE Z ok.
[右] PASV
[右] 502 Command not implemented.
[右] 监听端口: 2286, 等待连接。
[右] PORT 192,168,1,3,8,238
[右] 200 PORT Command successful.
[右] MLSD
[右] 150 Opening BINARY mode data connection for MLSD.
[右] 226 Transfer complete. 1,291 bytes (373 compressed to 28.89%) transferred. 0.36 actual KB/sec, 1.26 effective KB/sec.
[右] 列表完成: 1 KB 于 5.36 秒 (0.2 KB/秒)

------解决方案--------------------
[右] PASV 
[右] 502 Command not implemented. 
------
因为你的Serv-U配置为不支持PASV模式...正常的...