Modo ativo do servidor FTP Não é possível conectar

Question

Não consigo me conectar ao servidor FTP por meio do Modo Ativo.

Filezilla with Active mode setting
/*******************************************************************************/
Status: Connecting to xx.xx.xx.xx:21...
Status: Connection established, waiting for welcome message...
Error:  Could not connect to server
Status: Waiting to retry...
Status: Connecting to xx.xx.xx.xx:21...
Status: Connection established, waiting for welcome message...
Error:  Could not connect to server
/*******************************************************************************/

Windows Command Prompt (After disabling Passive mode in Internet Options)
/*******************************************************************************/
ftp> open
To xx.xx.xx.xx
Connected to xx.xx.xx.xx.
Connection closed by remote host.
ftp>
/*******************************************************************************/

Eu verifiquei através da varredura de porta, porta 21 & 80 estão abertos. Eu adicionei exceção de firewall & antivírus desativado

Atualização do administrador do servidor: ele pode conectar o & a seguir está o log:

Status:    Connecting to xx.xx.xx.xx:21...
Status:    Connection established, waiting for welcome message...
Response:    220 Microsoft FTP Service
Command:    USER Username
Response:    331 Password required for Username.
Command:    PASS ********
Response:    230-Welcome to ftp.site.com
Response:        Access to this site is monitored and logged.
Response:        Access is restricted to Authorized users only.
Response:        If you are not authorized to access this service please disconnect now.
Response:        If you encounter any problems, please send a mail to [email protected] for any problems with this service.
Response:    230 User Username logged in.
Command:    SYST
Response:    215 Windows_NT
Command:    FEAT
Response:    211-FEAT
Response:        SIZE
Response:        MDTM
Response:    211 END
Status:    Server does not support non-ASCII characters.
Status:    Logged in
Status:    Retrieving directory listing...
Command:    PWD
Response:    257 "/" is current directory.
Command:    TYPE I
Response:    200 Type set to I.
Command:    PORT 192,168,0,201,226,200
Response:    200 PORT command successful.
Command:    LIST
Response:    150 Opening BINARY mode data connection for /bin/ls.
Response:    226 Transfer complete.
Status:    Calculating timezone offset of server...
Command:    MDTM Global.asax
Response:    213 20080825114103
Status:    Timezone offset of server is -21600 seconds.
Status:    Directory listing of "/" successful

Atualização: Finalmente, o administrador do servidor concordou em investigar o problema e pediu o IP usado para conexão. Depois de mudanças de seu fim; a conexão & o login é bem-sucedido, mas a listagem do diretório está dando erro.

Status: Connecting to xx.xx.xx.xx:21...
Status: Connection established, waiting for welcome message...
Status: Insecure server, it does not support FTP over TLS.
Status: Server does not support non-ASCII characters.
Status: Logged in
Status: Retrieving directory listing...
Command:    PWD
Response:   257 "/" is current directory.
Command:    TYPE I
Response:   200 Type set to I.
Command:    PORT 192,168,1,100,192,167
Response:   500 Invalid PORT Command.
Error:  Failed to retrieve directory listing