Delay between STOR command and 150 Connection response

["Evan Harris" <evan.harris@xxxxxxxxxxxxxxxxxxx>]

   Hi there

   I have a customer who has been using the FTPAPI for some time now and
   have recently been experiencing a problem whereby FTP transfers are
   starting to backlog due to delays in the put operations completing.

   A sample transfer looks like this:

   > TYPE I
   200 Type set to IMAGE.
   > PORT 10,1,32,1,51,88
   200 command successful
   > STOR PO_699809.XML
   150 Opening BINARY data connection for PO_699809.XML
   226 transfer complete

   The job log message time sent on the STOR shows as 13:22:33 and the
   150 response shows as 13:22:48. The 226 reports a time of 13:22:49.

   What does the time delay between the STOR and the 150 response tell me
   ? Does it for example indicate that remote server is taking a little
   time to respond with the required information to complete the transfer
   (i.e. port etc) ?

   When running more or less the same code internally we don't see the
   same delay between the STOR command and the 150 response.

   I guess I'm wondering what actually happens between the STOR command
   the 150 so I can investigate what might be causing the delays I am
   seeing.

   Regards
   Evan Harris

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