Re: Problem with Scott's procedure FTP_list

[Scott Klement <sk@xxxxxxxxxxxxxxxx>]

Sender: Scott Klement <sk@xxxxxxxxxxxxxxxx>


hi Werner,

> The Job, which uses the FTP API, runs on status "TIMW" :
>
> Subsystem/Job  User            Type  CPU %   Function             Status
>  SRC540_40    N175SRMS    BCH    0,0      PGM-SRC540       TIMW
>
> When I debug the program, I'm standing on the statement with the FTP_List
> call:
>
> rc = FTP_List(fd: '  ':99:%addr(incoming): num_files);


The FTP_list() subprocedure is waiting for data to come over the network, 
and it's not receiving it.

Each time FTP transfers data (with a GET, PUT or LIST request) the client 
and server negotiate a new TCP port to send it over. The flaw in this 
logic is that there might be a firewall in between. Since it uses a 
different port each time, that will frequently cause problems.

My guess is that you have a range of ports that's open on the firewall for 
FTP. When one happens to fall outside of that range (perhaps this only 
happens rarely) the data transfer connection gets "stuck".

I can't really fix this inside FTPAPI. The best I could do is make it time 
out so that you could try again.  Unfortunately, I don't know when I'll 
have time to work on it...

---
Scott Klement  http://www.scottklement.com

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