No much hits when google it, wondering if can get some help here.

A linux redhat enterprise 6.4 as host, KVM Windows 7 as guest. No problem with ftp to other host in local LAN from linux host, but when ftp from KVM guest, I can login, change directory with "cd", but fail when use command "get" "put" "ls/dir". error message says: connection closed by remote host. it seems the data connection is blocked.

I have no problem to ping from KVM, even no problem using webbrowser to access ftp server like this ftp://userassword@server ip/

I suspect something wrong with firewall in linux, but i can ftp from linux host without problem... any idea ?

Thanks,
Dan

Recommend you check firewall and FTP connection method.

http://slacksite.com/other/ftp.html

Thank you. Read the document,it helps me unstand the two modes, but I still can not fix my problem.

192.168.10.123 is the remote host

192.168.1.101 is the local host
192.168.122.3 is the KVM Windows 7 (use NAT)

ftp from 192.168.122.3 (kvm) to 192.168.10.123

C:\Users\IBM_ADMIN>ftp -d 192.168.10.123
Connected to 192.168.10.123.
User (192.168.10.123none)): myid
---> USER myid
331 Send password please.
Password:
---> PASS mypwd
230 myid is logged on. Working directory is "/u/myid".
ftp> quote pasv
---> pasv
227 Entering Passive Mode (192.168,10,123,60,186)
ftp> ls
---> PORT 192,168,122,3,192,169
Connection closed by remote host.
ftp>

No problem ftp from 192.168.1.101 to 192.168.10.123

-- Dan

Did you make any effort to check the relevant port ranges for the two FTP modes? Did you try NOT using PASV mode?