FTP over TCP port sim300 modem Problem

i hav done the successful communication with ftp server using tcp port 2021,i hv made the directory in server successfully but for data connection i have write below last command but it shows error?
Could you please check and revert.

+CREG: 1,"0C25","084A"

RDY

+CFUN: 1

+CPIN: READY
at
OK
at
OK
at+creg?
+CREG: 0,1

OK
at+cgatt=1
OK
at+cstt="airtelgprs.com","",""
OK
at+cipscont?
SHOW APPTCPIP CONTEXT
+CDNSORIP:0
+CIPSPRT:1
+CIPHEAD:0
+CIPFLP:1
+CIPSRIP:0
+CIPCSGP:1
Gprs Config APN:airtelgprs.com
Gprs Config UserId:
Gprs Config Password:
Gprs Config inactivityTimeout:0
+CIPDPDP:1
Detect PDP Inerval:10
Detect PDP Timer:3
App Tcpip Mode:0

OK
at+ciicr
OK
at+cifsr
117.98.156.60
at+clport?
TCP: 2020
UDP: 3030

OK
at+clport="tcp","2021"
ERROR
at+clport="tcp","2021"
ERROR
at+clport="tcp","2021"
ERROR
at+clport="tcp","2021"
OK
at+clport?
TCP: 2021
UDP: 3030

OK
at+cipstart="tcp","124.124.124.100","21"
OK

CONNECT OK
220-FileZilla Server version 0.9.41 beta
220-written by Tim Kosse (Tim.Kosse@gmx.de)
220 Please visit https://sourceforge.net/projects/filezilla/
at+cipsend
> user iris

SEND OK
500 Syntax error, command unrecognized.
at+cipsend
> user iris

SEND OK
331 Password required for iris
at+cipsend
 Pass iris
SEND OK
230 Logged on
at+cipsend
> Mkd testt

SEND OK
257 "/testt" created
at+cipsend
> Cwd testt

SEND OK
250 CWD successful. "/testt" is current directory.
at+cifsr
117.98.156.60
at+cipsend
> Port 117,98,156,60,7,229

SEND OK
200 Port command successful
at+cipsend
> Appe file.txt

SEND OK
150 Opening data channel for file transfer, restarting at offset 0
425 Can't open data connection.

if someone has solved, i can help please me

To Transfer the Files and Use Filezilla FTP server

AT+CSTT="AIRTELGPRS.COM","",""

AT+CIPSCONT?

AT+CIICR

AT+CIFSR

AT+CIPSERVER?

AT+CIPSERVER

AT+CLPORT?

AT+CLPORT="TCP","2021"

AT+CIPSTART="TCP","Your server ip","21"

AT+CIPSEND

User Username

AT+CIPSEND

Pass UseraPASSword

AT+CIPSEND

Mkd TEST

AT+CIPSEND

Cwd TEST

AT+CIPSEND

Port 88,214,93,220,7,228

AT+CIPSEND

Appe file.txt

AT+CIPCCON=2

AT+CIPSEND

Text for file 12345

AT+CIPCCON=1

AT+CIPSEND

ABOR

AT+CIPCLOSE

-----------------------------------------------

To get The Files
AT+CIPSTART="TCP","Server IP","21"

AT+CIPSEND

User Username

AT+CIPSEND

Pass Userpassword

AT+CIPSEND

Mkd TEST

AT+CIPSEND

Cwd TEST

AT+CIPSEND

Port 88,214,93,220,7,228

AT+CIPSEND

RETR file.txt

AT+CIPSEND

LIST


To connect to SIMCOM Server to give the below IP address from Mozilla

110.226.76.228:2020

after command sent AT + CIFSR gives me an IP, i used

AT+CIPSEND
Port ip,7,228

SEND OK
200 Port command successful
at+cipsend
> Appe file.txt

SEND OK
150 Opening data channel for file transfer, restarting at offset 0
425 Can't open data connection.


Why should the ip port? what modem you use?

Please post the all commands

RDY

+CFUN: 1

+CPIN: READY

+CREG: 0

+CREG: 2

Call Ready

+CREG: 1

+CGREG: 0

+CGREG: 1
at+cstt="broadband"
OK
at+cipscont?
+CIPSCONT:1
+CIPCSGP:1
Gprs Config APN:broadband
Gprs Config UserId:
Gprs Config Password:
+CLPORT:0,0
+CIPHEAD:0
+CIPSHOWTP:0
+CIPSRIP:0
+CIPATS:0,0
+CIPSPRT:1,0
+CIPQSEND:0
+CIPMODE:0
+CIPCCFG:5,2,1024,1
+CIPMUX:0
+CIPDPDP:1,10,3
+CIPRXGET:0
+CIPQRCLOSE:0
+CIPUDPMODE:0

OK
at+ciicr
OK
at+cifsr
10.18.171.84
at+cipserver?
+CIPSERVER: 0

OK

at+clport?
TCP: 0
UDP: 0

OK
at+clport="TCP","2021"
OK
at+cipstart="tcp","95.64.115.21","21"
OK

CONNECT OK
220-FileZilla Server version 0.9.41 beta
220-written by Tim Kosse (Tim.Kosse@gmx.de)
220 Please visit https://sourceforge.net/projects/filezilla/
at+cipsend
> user xxxxxx

SEND OK
331 Password required for marius

at+cipsend
> pass xxxxxxx

SEND OK
230 Logged on

at+cipsend
> cwd test

SEND OK
250 CWD successful. "/test" is current directory.
at+cipsend
> port 10,18,171,84,7,228

SEND OK
200 Port command successful
at+cipsend
> appe test.txt

SEND OK
150 Opening data channel for file transfer, restarting at offset 0
425 Can't open data connection.

at+cipccon=2
ERROR


I do not know what is with AT + CIPSERVER????
I think the problem is an FTP server not found modem ip sim900d (external ip)

You have to make your modem as server AT+CIPSERVER=1 then again try with same commands

If you enable cipserver = 1, i need multiconnection and not allow me to set my at + clport = "tcp", "2021"
Enable cipserver = 1 and gives me the same error
150 Opening data channel for file transfer, restarting at offset 0
425 Can't open data connection
what modem using??