Hal,

I should have read the title of your post :D. Then I'd know that you're using 
the z/OS server.

After establishing the FTP session, type the following

SITE    EPSV4
LOCSITE   EPSV4

I can't guarantee that the LOCSITE command will work on the FTP client you're 
using. EPSV4 is the IBM keyword used to activate the EPRT and EPSV commands 
described in RFC 2428. In passive mode, the client will send a EPSV command to 
the server (rather than PASV). This is similar to the PASV command EXCEPT that 
the server responds with EPRT (rather than PORT), which specifies a port number 
ONLY. Thus, the  client establishes the "data" session using the same IP 
address that was used to establish the FTP session (i.e. the server's NATed 
address).

Hope that helps,
Alan



-----Original Message-----
From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of 
Hal Merritt
Sent: Wednesday, June 01, 2011 2:47 PM
To: [email protected]
Subject: Z/os FTP Server Configurartion

One of my network guys says that some servers allow the coding of a different 
IP address to be used in the handshake.

Normally, FTP in passive mode sends the host IP address and port number for the 
client to use. This is useless if there is a NAT'ing firewall in the path. My 
guy claims that you can change that to specify any address you want, 
specifically the NAT'ed address.

Anyone know what he is talking about?


Thanks!!

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