ftp connection warning: setsockopt (SO_KEEPALIVE): Invalid argument

[Michael Horn]

Hello,

is there anybody could help me fining a problem between two Solaris
machines.
It seem that the connection is established, but the there

Especially I don't know the warning

setsockopt (SO_KEEPALIVE): Invalid argument

see below...

1. ftp client named css102 (SunOS css102 5.8 Generic_108528-07 sun4u
sparc SUNW,Ultra-5_10)

this ist the output of the session on the client:

ftp> [horn@css102]_7 > ftp ftp
Connected to ftp.
220 ftp FTP server (Welcome to the ftp server of the Tele Atlas
Deutschland GmbH, 31177 Harsum Germany) ready.
Name (ftp:horn):
331 Password required for horn.
Password:
230 User horn logged in.
ftp> dir
200 PORT command successful.
425 Can't build data connection: Connection reset by peer.
ftp> ls -l
200 PORT command successful.
150 ASCII data connection for /bin/ls (133.17.6.122,34994) (0 bytes).

----- here the system "hangs", and was interrupted by hand (^C^C)
-----

226 ASCII Transfer complete.

421 Service not available, remote server has closed connection
ftp>
[horn@css102]_8 >

2. ftp server named ftp (SunOS ftp 5.8 Generic_108528-07 sun4u sparc
SUNW,Ultra-1)

debug information on the server:

May 30 14:10:58 ftp in.ftpd[641]: [ID 738965 daemon.debug] ftp FTP
server (Welcome to the ftp server) ready.
May 30 14:10:59 ftp in.ftpd[641]: [ID 577562 daemon.debug] command:
USER horn^M
May 30 14:10:59 ftp in.ftpd[641]: [ID 988435 daemon.debug] <--- 331
May 30 14:10:59 ftp in.ftpd[641]: [ID 337738 daemon.debug] Password
required for horn.
May 30 14:11:02 ftp in.ftpd[641]: [ID 416587 daemon.debug] command:
PASS <passwd>
May 30 14:11:02 ftp in.ftpd[641]: [ID 988435 daemon.debug] <--- 230
May 30 14:11:02 ftp in.ftpd[641]: [ID 636382 daemon.debug] User horn
logged in.
May 30 14:11:06 ftp in.ftpd[641]: [ID 577562 daemon.debug] command:
PORT 133,17,6,122,136,177^M
May 30 14:11:06 ftp in.ftpd[641]: [ID 988435 daemon.debug] <--- 200
May 30 14:11:06 ftp in.ftpd[641]: [ID 223037 daemon.debug] PORT
command successful.
May 30 14:11:06 ftp in.ftpd[641]: [ID 577562 daemon.debug] command:
LIST^M
May 30 14:11:06 ftp in.ftpd[641]: [ID 988435 daemon.debug] <--- 425
May 30 14:11:06 ftp in.ftpd[641]: [ID 534210 daemon.debug] Can't build
data connection: Connection reset by peer.
May 30 14:11:26 ftp in.ftpd[641]: [ID 577562 daemon.debug] command:
PORT 133,17,6,122,136,178^M
May 30 14:11:26 ftp in.ftpd[641]: [ID 988435 daemon.debug] <--- 200
May 30 14:11:26 ftp in.ftpd[641]: [ID 223037 daemon.debug] PORT
command successful.
May 30 14:11:26 ftp in.ftpd[641]: [ID 577562 daemon.debug] command:
NLST -l^M
May 30 14:11:26 ftp in.ftpd[641]: [ID 988435 daemon.debug] <--- 150
May 30 14:11:26 ftp in.ftpd[641]: [ID 742713 daemon.debug] ASCII data
connection for /bin/ls (133.17.6.122,34994) (0 bytes).
May 30 14:11:26 ftp in.ftpd[641]: [ID 844734 daemon.warning]
setsockopt (SO_KEEPALIVE): Invalid argument
May 30 14:11:26 ftp in.ftpd[641]: [ID 988435 daemon.debug] <--- 226
May 30 14:11:26 ftp in.ftpd[641]: [ID 766787 daemon.debug] ASCII
Transfer complete.
May 30 14:11:36 ftp in.ftpd[641]: [ID 103687 daemon.debug] lost
connection

The ftp server is located in a DMZ, the client in the local internal
corporate net.
The firewall between both machines accepts this ftp connection, nothing
is dropped or rejected.

Any help is highly appreciated.

--
Best regards and thanks in advance.

Michael Horn