[Zope] FTP Hang after PWD (desperate)

[Jens Vagelpohl]

FTP uses two communication channels. this is a basic part of the FTP 
protocol. the first channel is for commands and the second for data.

there is probably a lot of resources on the web that can explain how a FTP 
server handles these two connections and how the behavior changes if the 
client sets passive mode.

jens


On Friday, April 26, 2002, at 05:48 , Roel Van den Bergh wrote:

> Problem: FTP client hangs after issueing PWD command.
>
> We are behind a firewall and the Zope server is behind a firewall
> I have access to ours but the people who are hosting the server are not 
> very
> cooperative :-(
>
>
> Searching the message list I find this is due to a NAT problem
>
> For testing purposes I allowed every incoming port from the external server
> to go trough every port here wich I'm not very happy with.
> Still the ftp connection hangs.
>
> Does the Zope FTP server uses other ports then the initialy set 8021 port 
> to
> communicate?
>
> The ftp client is set to passive mode.
> Running Zope 2.5.1 on RedHat 7.0 with Apache 1.312
>
> Every tip would be very much appreciated
>
> TIA Roel