<s>
WU-FTPD	B-Protocol
(	O
more	O
fully	O
wuarchive-ftpd	O
,	O
also	O
frequently	O
spelled	O
in	O
lowercase	O
as	O
wu-ftpd	B-Protocol
)	O
is	O
a	O
free	B-Application
FTP	B-Protocol
server	O
software	O
(	O
daemon	B-Operating_System
)	O
for	O
Unix-like	B-Operating_System
operating	I-Operating_System
systems	I-Operating_System
.	O
</s>
<s>
It	O
was	O
originally	O
written	O
by	O
Chris	O
Myers	O
and	O
Bryan	O
D	O
.	O
O'Connor	O
in	O
Washington	O
University	O
in	O
St.	O
Louis	O
as	O
a	O
replacement	O
of	O
the	O
BSD	O
FTP	B-Protocol
daemon	B-Operating_System
,	O
for	O
use	O
in	O
the	O
Washington	O
University	O
network	O
,	O
primarily	O
the	O
large	O
site	O
.	O
</s>
<s>
Around	O
1999	O
,	O
the	O
project	O
's	O
oversight	O
was	O
provided	O
by	O
a	O
loose	O
group	O
of	O
developers	O
working	O
as	O
the	O
WU-FTPD	B-Protocol
Development	O
Group	O
,	O
which	O
counted	O
Gregory	O
Lundberg	O
among	O
them	O
.	O
</s>
<s>
BeroFTPD	O
was	O
also	O
an	O
offshoot	O
of	O
WU-FTPD	B-Protocol
,	O
which	O
saw	O
feature	O
improvements	O
made	O
into	O
the	O
code	O
.	O
</s>
<s>
The	O
last	O
known	O
release	O
of	O
that	O
software	O
was	O
1.3.4	O
before	O
it	O
was	O
merged	O
back	O
into	O
the	O
WU-FTPD	B-Protocol
codebase	O
yielding	O
wu-ftpd-2.6.0	O
as	O
a	O
result	O
.	O
</s>
<s>
Up	O
until	O
the	O
early	O
2000s	O
,	O
it	O
was	O
the	O
most	O
common	O
FTP	B-Protocol
server	O
software	O
in	O
use	O
,	O
though	O
its	O
use	O
has	O
lessened	O
in	O
recent	O
years	O
due	O
to	O
availability	O
of	O
more	O
feature-rich	O
and	O
easier-to-configure	O
software	O
,	O
and	O
primarily	O
due	O
to	O
its	O
perceived	O
lack	O
of	O
security	O
and	O
the	O
perceived	O
complexity	O
of	O
the	O
source	O
code	O
.	O
</s>
<s>
In	O
2001	O
,	O
for	O
example	O
,	O
the	O
Ramen	O
worm	O
used	O
WU-FTPD	B-Protocol
as	O
one	O
of	O
the	O
possible	O
intrusion	O
mechanisms	O
.	O
</s>
