FTP client block

[Marco A. Ramos]

Hello every one,



Any idea will be very appreciative, because I’m stock with this problem,



I develop a FTP client program (with gcc) and is work fine with 5 different
entities (3 windows FTP server, and 2 NetWare FTP server), but when other
Netware FTP server the client program is blocking at start to interact with
the server, is like if the FTP server not respond, but if I try manually
with shell the server woks fine, I try to send different command and
nothing.



(I have not access to the FTP server, it is a external company and they will
not provide any help)



This is a interaction using the Linux ftp client (from shell)

[root at ramaclinux ftp]# ftp -d 172.64.165.34

Connected to 172.64.165.34.

220 FTP server (NetWare v4.11) ready.

---> AUTH GSSAPI

500 'AUTH GSSAPI': command not understood.

---> AUTH KERBEROS_V4

500 'AUTH KERBEROS_V4': command not understood.

KERBEROS_V4 rejected as an authentication type

Name (172.64.165.34:root): guest02

---> USER guest02                      (it take like 5 seconds to respond)

331 Password required for guest02.

Password:

---> PASS XXXX

230 Successful Login

---> SYST

215 NetWare system type.

Remote system type is NetWare.

ftp> close

---> QUIT

221 Goodbye.

ftp> by



As you can see the FTP server answer fine.



This is an interaction from my FTP client FTP

Conecting to 172.64.165.34 ...

220 FTP server (NetWare v4.11) ready.

---> AUTH GSSAPI:

And Never respond!!



The tcpdump result for the fisrt example are:
14:42:22.266330 192.168.1.3.45319 > 172.64.165.34.ftp: S
923128954:923128954(0) win 5840 <mss 1460,sackOK,timestamp 484894093
0,nop,wscale 0> (DF)

14:42:22.290053 192.168.1.3.45319 > 172.64.165.34.ftp: . ack 1314115281 win
5840 (DF)

14:42:22.317446 192.168.1.3.45319 > 172.64.165.34.ftp: . ack 55 win 5840
(DF) [tos 0x10]

14:42:22.317833 192.168.1.3.45319 > 172.64.165.34.ftp: P 0:13(13) ack 55 win
5840 (DF) [tos 0x10]

14:42:22.351434 192.168.1.3.45319 > 172.64.165.34.ftp: P 13:31(18) ack 99
win 5840 (DF) [tos 0x10]

.

.

Continue






And for the FTP client program:

14:45:49.447851 192.168.1.3.45366 > 172.64.165.34.ftp: S
1146613991:1146613991(0) win 5840 <mss 1460,sackOK,timestamp 484914811
0,nop,wscale 0> (DF)

14:45:49.478695 192.168.1.3.45366 > 172.64.165.34.ftp: . ack 1314175633 win
5840 (DF)

14:45:49.506095 192.168.1.3.45366 > 172.64.165.34.ftp: . ack 55 win 5840
(DF)

14:45:49.506410 192.168.1.3.45366 > 172.64.165.34.ftp: P 0:12(12) ack 55 win
5840 (DF)

14:47:22.733207 192.168.1.3.45366 > 172.64.165.34.ftp: F 12:12(0) ack 55 win
5840 (DF)



This is the line where it block!!





Any help,





Thank you, regards.



 Marco Antonio Ramos