Paul, I have exactly the same problem.  You are not alone.  
Here's an additional dimension of the cfftp problem. 
I back up some files of various sizes to a remote site using an automated cf 
task. The page essentially loops through an array of files that it determines 
need to be ftp'd (backed up).  In the loop is the cfftp tag and attributes to 
put the file. [Note that I discovered (through some back and forth with the 
Adobe team) that a "dummy" connection name is *required* for the timeout 
variable to be effective.]

In the looped cfftp tag, I set the timeout attribute for each putFile action 
dynamically, allowing 15 secs per MB of filesize, with a minimum of 31 seconds 
per file.  "small" files ftp just fine.  The first "big" file ftp attempt 
completes just fine (i.e., the file transfer is complete), but then CF seems to 
lose its place.  The evidence for this is that not a single line of code is 
executed after the big file transfer...the page simply dies (although it says 
'done').  

I've tried everything [or so it seems].  I've set the cfsetting requesttimeout 
to 3600 (60 minutes). No effect.  I've tried setting up and using a cfftp 
connection with a 3600 timeout. The connection gets killed after the first 
reuse of the connection.

Any suggestions welcome!

I use "small" and "big" here in quotes only because I haven't iterated enough 
to find the dividing line.  60MB and up files definitely cause the problem and 
2MB files don't cause the problem.

LMK if you've discovered any work arounds to this very annoying problem.



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