> Is the a limit to the size of file I can PutAsync?

No limits in recent versions of ICS that use int64.  
 
> I am trying to upload a large file (84GBytes) to a FTP site. The 
> file seems
> to transfer OK, but there is nothing to signal the transfer is 
> complete. No ftpPutAsync and no ftpError event.

I've certainly transferred VHD files in the 10 to 20 gig region, but
never 84 gigs.  Since ICS is event driven, when the data and control
sockets close you must be getting events of some sort, irrespective of
file size or transfer time.

The most common reason for errors like this are your application has a
timer that has not been regular updated during the transfer process, and
has given up waiting for the transfer to finish.  

I suggest you try the compiled demo application from TMagFtp which has a
Single FTP option and see it that works OK, it should. 

Angus

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