Turning off Extended Passive Mode

[tkett276]

Hi Everyone,

I'm running into an issue with FTP_list in FTPAPI — the call locks up, then eventually disconnects due to a timeout.

I traced the problem by testing directly from the command prompt. Running ls to produce a file listing would always hang and eventually disconnect.

Here’s the relevant portion of the log:

Unix Version: FTP server
cd /download
250 CWD command successful
ls
229 Entering Extended Passive Mode (|||20911|)


Using the command sendepsv 0 before running ls resolved the issue — the client entered normal passive mode instead of extended passive (EPSV).

I then forced the FTP client to never use EPSV by creating a data area:

CRTDTAARA DTAARA(QUSRSYS/QTMFTPEPSV) TYPE(*LGL) AUT(*USE)


After this, I no longer had to manually use sendepsv 0; all connections defaulted to standard passive mode.

However, I don’t see an option in FTPAPI to disable EPSV.

Does anyone know how to force FTPAPI to use standard passive mode instead of EPSV, or another workaround?

Thanks in advance!

[vhamberg]

Hi

Version 2.6 has support for enhanced, as stated in the CHANGELOG.TXT - "Added support for enhanced (EPSV, EPRT) data channel commands"

This version is available at https://github.com/ScottKlement/ftpapi

Regards
Vern

[tkett276]

I'm using V2.8

My issue is that it is using EPSV, The server I need to connect to does not appear to be able to handle it.

Doing it manually without FTPAPI involved has the same issue until I force the IBM I FTP Client to not use EPSV.

Once that is done, it happily sends back my file listing. I need to know how do the same thing to FTPAPI... or if it is currently not possible.

[Scott Klement]

FTPAPI automatically attempts to downgrade from EPSV to PASV if the server doesn't understand EPSV.

[tkett276]

Thanks Scott,

This vendors server is not giving me a chance... it just locks and disconnects.

So hopefully my situation will give you something to put in V2.9

In mean time I rewrote my program to do it the old fashion way using a script writer with CL Command call to the Native FTP client.
It works... but not as clean to read as using FTPAPI.

I sincerely appreciate being able to use it.

[Scott Klement]

If the server locks up when it receives a command it doesn't understand, that's a bug in the server, not a bug in FTPAPI.