[scotty321]

Hi there,

My ISP (Comcast, formerly AT&T Broadband) has disabled incoming access on port 20 for all of their customers.

What this means is that I can no longer have clients FTP me large files directly to my machine, because port 20 is the default FTP port.

Does anybody have any step-by-step instructions on how to tell the built-in FTP client of 10.2.x to use a different port, instead of port 20? I'm assuming that it would involve a trip to the terminal, but I'm not sure what commands to type in.

Thanks!

Sincerely,
Scott

[dettociao]

Are the clients connecting to YOU as an FTP server? Or are you connecting to them, and grabbing a file. The default port for FTP should be 21, unless it is SFTP.

-nate

[scotty321]

Yes, they're trying to connect to my machine as an FTP server. It's possible that it's port 21 that's being blocked my ISP.

[Cipher13]

Originally posted by scotty321:
Yes, they're trying to connect to my machine as an FTP server. It's possible that it's port 21 that's being blocked my ISP.

Do you use a router? If so, set up a rule like this:

203.164.55.55:90 -> 10.0.0.2:21

or whatever. Traffic hitting your external IP on port 90 will be redirected to port 21 on your internal machine at 10.0.0.2.

If you don't use a router...

Well, Comcast could be blocking 20 or 21. Either way might screw you. 20 is often used as the "data" port, if the server process is listening on 21.

ftpd -P dataport

will change the dataport, if only it has been blocked.

I think that's right. I can't remember how to change the other port, off the top of my head. It's probably configurable in the ftpd.conf file or whatever it may be called.

Correct me if I'm incorrect about any of this... it's too early in the morning to be thinking...