Re: FTP Problem

[Scott Klement <pctech@xxxxxxxxxxxxxxxx>]

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.