Set 'timeout RFC931 0' to the /etc/ftpaccess file.
if that doesn't work, try:
In your /etc/xinetd.d/wu-ftpd file, check to see
if you have the "USERID" option set for either "log_on_success" or
"log_on_failure". If so, remove the "USERID" option. I guess having that
in there causes ident to try and figure out who is logging in regardless of
what flags or server args you are using.