09-24-2010
Yeah. Check that both port 20 and port 21 are open on the firewall.
If it is not a firewall issue there are a huge list of possible causes. Some are:
1) Second computer in this FTP relay chain is hung.
2) Transient network break
3) Cisco routers with "jumbo packets" enabled.
4) Incorrect network speed/duplex settings. Expecially any "autonegotiate".
5) Duplicate IP address.
If is is not a firewall setting try a small block size e.g. "ftp -B 1". This will tell tell you wheter a router has erroneously negotiated "jumbo packets" which are known to hang FTP.
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LEARN ABOUT MOJAVE
curlopt_ftpport
CURLOPT_FTPPORT(3) curl_easy_setopt options CURLOPT_FTPPORT(3)
NAME
CURLOPT_FTPPORT - make FTP transfer active
SYNOPSIS
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_FTPPORT, char *spec);
DESCRIPTION
Pass a pointer to a zero terminated string as parameter. It specifies that the FTP transfer will be made actively and the given string will
be used to get the IP address to use for the FTP PORT instruction.
The PORT instruction tells the remote server to connect to our specified IP address. The string may be a plain IP address, a host name, a
network interface name (under Unix) or just a '-' symbol to let the library use your system's default IP address. Default FTP operations
are passive, and thus won't use PORT.
The address can be followed by a ':' to specify a port, optionally followed by a '-' to specify a port range. If the port specified is 0,
the operating system will pick a free port. If a range is provided and all ports in the range are not available, libcurl will report
CURLE_FTP_PORT_FAILED for the handle. Invalid port/range settings are ignored. IPv6 addresses followed by a port or portrange have to be
in brackets. IPv6 addresses without port/range specifier can be in brackets.
Examples with specified ports:
eth0:0
192.168.1.2:32000-33000
curl.se:32123
[::1]:1234-4567
You disable PORT again and go back to using the passive version by setting this option to NULL.
The application does not have to keep the string around after setting this option.
DEFAULT
NULL
PROTOCOLS
FTP
EXAMPLE
TODO
AVAILABILITY
Port range support was added in 7.19.5
RETURN VALUE
Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not, or CURLE_OUT_OF_MEMORY if there was insufficient heap space.
SEE ALSO
CURLOPT_FTP_USE_EPRT(3), CURLOPT_FTP_USE_EPSV(3),
libcurl 7.54.0 December 21, 2016 CURLOPT_FTPPORT(3)