Have you tried with some public ftp-server?
Does it work then? And what is the full error message?

--Jani

Send this bug-message this morning, got two answers myself this evening:
Obviously php does not understand ftp-server-adresses in form of "127.0.0.1" or somehow, but when I used "localhost" or the name of the server defined in the Apache-Konfiguration the script below ran without any error-message. 
Another workaround: using '127.0.0.1' ran also without problems!?!
kni

Now the third answer for sniper@php.net (Hi Jani, I saw your question unfortunately just after I sent my last report):

I used the ftp-server WAR-FTPD 1.67-05 (freeware, downloadable from http://www.jgaa.com) and tried it localy installed on my NT4.0 Worsstation with an external NT4.0 Intranet-Webserver (Apache with PHP 4.04).At home I used a Windows 2000 Workstation with local running Apache and PHP 4.0.4 first, 4.0.5 after a meanwhile update.

The original error-message on all configurations was:
"Warning: Unable to find ftpbuf 0 in e:\eigene dateien\php\liegenschaften\upload.php4 on line 10"

Some new information:
To my surprise this error does not occur at home, when I am connected to Internet. After dialing in the script runs also with "127.0.0.1" without any warnings, after shutting down the Internet-connection only $ftp_server = "localhost" or $ftp_server="#DNS_name_of_server#" is accteptd.
This is also the reason for my second "workaround" as described before, this is no one, because '127.0.0.1' is only accepted when internet-connection is open.

Hope, this will help you!
bye... kni

Are you saying that 127.0.0.1 only works when you are
connected to the internet, but localhost works anytime?

What happens I think, is that ftp_connect uses
gethostbyname to look up the name, it's called with 127.0.0.1 if you specify that. It looks like
gethostbyname tries to look up the address for
127.0.0.1 and if it can't contact any nameservers it
simply fails. If you use localhost there is probably
something like the host file on UNIX, or maybe it is
hardcoded, that says that localhost is 127.0.0.1. The
implementations I've seen of gethostbyname will notice
that it's an IP address and do no lookup, this might
not be the case on NT 4.0... If this is a general
problem (bug #11025 is similar), I suggest we fix it
by calling php_network_getaddresses() rather than doing
all the work in ftp.c. php_network_getaddresses() avoids
gethostbyname() on IP addresses.

fopen uses php_network_getaddresses(). If
fopen("ftp://127.0.0.1/...") or http://... works for you
I'll fix this for ftp_connect()

What was the result? Does fopen("http://...") or fopen("ftp://...") work for you?

--Jani

No feedback.

I'm using PHP 4.1.1 on a FreeBSD machine.

I have a script that basically connects to a ftp server, does the login, gets a file and then quits.
It worked fine for over a month, but now it outputs this error:

Warning: Unable to find ftpbuf 0 in /path/script.php on line x

line x is $login_result = ftp_login($conn_id, "$ftp_user", "$ftp_pass");

The ftp server I'm trying to connect to is working as I can connect to it with a ftp client.

Other public ftp servers work fine

Anybody who can help?

Thank you