Re: FTP Problem

You say that the error is a timeout? When does the timeout occur? Does it occur on the initial connection, or does it occur when trying to perform a transfer (i.e. a PUT, GET or directory listing).

In either case, it's most likely a firewall issue. But, what needs to be changed in the firewall would be very different depending on where the error occurs.

If it happens during a data transfer, changing to passive mode may help. Data transfers occur on a random port number, and that makes firewall management somewhat complicated. It also creates issues with NAT since the port number is communicated through the control channel, and NAT needs to therefore change the data sent in teh control channel.

On the other hand, if it's happening immediately during the initial connection, then it's a simple TCP connection to port 21 that's being blocked by a firewall.

If you're not sure, you can do a simple test via TELNET. Just telnet to port 21 on the FTP server. If you get a 220 response in the telnet window, then the initial connection is working okay, and that's not the problem. (You cannot test data transfers in telnet, however, since telnet isn't FTP!)


Jon Paris wrote:

FTP (and FTP client in Zend Studio) both fail with timeout. DNS has resolved to correct IP. User namer and PW verified by cut/paste into 5250 session on another i5 - FTP works.