how to discover uncompleted ftp/http transfers and temporary ftpaccounts

hi
basically i have two questions. using RH linux9.

1a.
if i have some one to download a file via http (apache 2.40) and the
download is aborted or in any other way not completed, how can i
discover this from the logs?

1b.
same question, only for ftp (wu-ftpd and/or vsftpd).


2.
on the linux machine, how can i add a temporary ftp-account account that
does allow ftp, but not terminal logon?


many thanks
stig