To return to the original problem:

<snip>
We have an application that does some client server stuff then attempts 
to
ftp some files back to z/OS.  Mostly this works fine except it seems 
when 2
or more ftps are attempted at the same time with the same userid.  Then 
we
get "failed to connect" to the z/OS ftp server.  Is there an ftp 
parameter
that would stop multiple ftps from the same user taking place.
<snip> 

I had the following FTP problem whose resolution may be of some value 
in your case:

We were, overnight, FTPing a large number of files from the mainframe
to Windoze servers. It seemed that some of the jobs were interfering
with each other (problems on the Windoze side of course) ... I
realized that: (1) The problems were transient. (2) The data to be
transmitted was accumulated through a number of steps. This data was
still 'available' after the FTP failure.

So I checked, in JCL, for a good return code from the FTP step. If
the return code was bad I: (1) Passed control to a 'wait' job that 
would wait x number of minutes. (2) Retried the FTP ... This solution 
worked very well.

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