Hi All,
I'm using a simple program that uploads a file on a remote ftp server.
This is an example (not the whole program):
def store(self,hostname,username,password,destdir,srcpath):
self.ftp = ftplib.FTP(hostname)
self.ftp.login(username,password)
self.ftp.set_pasv(False)
self.ftp.cwd(destdir)
fobj = file(srcpath,"rb")
destname = os.path.split(srcpath)[1]
self.ftp.storbinary("STOR "+destname,fobj)
The ftp server cannot use passive connections, and I can do nothing
about that. Here is the problem: I can connect to this ftp server from
my home computer, which is behind a NAT firewall. I can also connect to
it from another computer, but I'm not able to upload any file. I tried
to debug with a simple "ftp -v -d" command line program and apparently
the problem is with the "EPRT" command:
ftp> ls
---> EPRT |1|195.228.74.135|55749|
200 Port command successful.
---> LIST
425 Cannot open data connection.
ftp>
Well, the port number given by EPRT is bad - it is a closed port on this
computer. I can open a small port range for this, but I would not like
to open all ports and disable the firewall completely.
Here are my questions:
1. How can I instruct ftplib to use specific ports for incoming
connections? (For example, ports between 55000 and 56000).
2. How it is possible that the same program works from another computer
that is behind a NAT firewall?
Thanks,
Laszlo
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