File upload but "transfer failed"


if i upload a php file from Windows client to Windows server (2003), the file is transfered, get a "226 transfer complete." and just after this message a "Transfer failed."!

If i try to view the transfered file i get the old one, if i look at the file properties (using Properies / CHMOD) i get the new size of the file. If i wait (say 20 sec) the file is up to date.

Why this delay and how can i prevent it.


P.S.: Just downloaded filezilla and tested same transfer... no problems at all!

As always for such problems, you need to post the log.