我跟著教學安裝和設定 vsftpd 服務。
從本機伺服器連接，但遠端連線立即被拒絕。這是設定檔內容：
# /etc/vsftpd.conf
listen=NO
listen_ipv6=YES
anonymous_enable=NO
local_enable=YES
write_enable=YES
local_umask=022
dirmessage_enable=YES
use_localtime=YES
xferlog_enable=YES
ftpd_banner=Welcome to "My Cool" FTP service.
chroot_local_user=YES
userlist_enable=YES
userlist_file=/etc/vsftpd.userlist
userlist_deny=NO
chroot_list_enable=YES
chroot_list_file=/etc/vsftpd.chroot_list
chown_uploads=YES
chown_username=www-data
ftpd_banner=Welcome to mZoo FTP service.
chroot_local_user=YES
userlist_enable=YES
userlist_file=/etc/vsftpd.userlist
userlist_deny=NO
chroot_list_enable=YES
chroot_list_file=/etc/vsftpd.chroot_list
secure_chroot_dir=/var/run/vsftpd/empty
pam_service_name=vsftpd
rsa_cert_file=/etc/ssl/certs/ssl-cert-snakeoil.pem
rsa_private_key_file=/etc/ssl/private/ssl-cert-snakeoil.key
ssl_enable=NO
user_sub_token=$USER
pasv_min_port=40000
pasv_max_port=50000
force_dot_files=YES
21端口似乎是開放的：
telnet localhost 21
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
220 Welcome to "my cool" FTP service.
我嘗試過禁用fail2ban，但uwf似乎都不是原因。
遠端連線沒有出現在 中/var/log/vsftpd.log，但也許只記錄傳輸而不記錄實際連線。
順便說一下，uwf狀態是（但即使不活動也沒有連接）：
Status: active
To Action From
-- ------ ----
OpenSSH ALLOW Anywhere
20/tcp ALLOW Anywhere
21/tcp ALLOW Anywhere
40000:50000/tcp ALLOW Anywhere
990/tcp ALLOW Anywhere
OpenSSH (v6) ALLOW Anywhere (v6)
20/tcp (v6) ALLOW Anywhere (v6)
21/tcp (v6) ALLOW Anywhere (v6)
40000:50000/tcp (v6) ALLOW Anywhere (v6)
990/tcp (v6) ALLOW Anywhere (v6)
IP 表輸出這個要點如果相關的話。