| Constant |
Description |
FTP_SERVER_MULTIUSER
(0x0001) |
This option specifies the server should be started in
multi-user mode, where users are provided with their
own home directories based on their username. If this option is
not specified, then all users will share the server root
directory by default. This option does not affect the maximum
number of simultaneous client connections to the server. To
isolate users to their own individual home directory, combine
this option with the FTP_SERVER_RESTRICTED option. |
FTP_SERVER_RESTRICTED
(0x0002) |
This option specifies the server should be initialized
in a restricted mode that isolates the server and limits the
ability for clients to access files on the host system. All file
transfers are limited to the user's home directory. This option also
disables certain site-specific commands. This is a recommended
option for general purpose applications designed to accept
connections from clients over the Internet. This option is only
meaningful if the FTP_SERVER_MULTIUSER option has also been
specified. All clients are restricted to the server root
directory and its subdirectories, regardless of whether this
option is specified or not. |
FTP_SERVER_LOCALUSER
(0x0004) |
This option specifies the server should perform user
authentication using the Windows local account database. This
option is useful if the server should accept local usernames, or
if the application does not wish to implement an event handler
for user authentication. If this option is not specified, the
application is responsible for authenticating all users. |
FTP_SERVER_ANONYMOUS
(0x0008) |
This option specifies the server should accept
anonymous client connections. This is typically used to provide
public access to files without requiring the client to have
valid credentials on the server. Anonymous clients are
automatically authenticated by the server, but are restricted to
a public directory and subdirectories. If this option is
enabled, it is recommended that you also specify the
FTP_SERVER_READONLY option to prevent anonymous clients from
uploading files to the server. |
FTP_SERVER_READONLY
(0x0010) |
This option specifies the server should only allow
read-only access to files by default. If this option is enabled,
it will change the default permissions granted to authenticated
users. Anonymous clients will not be able to upload, rename or
delete files and cannot create subdirectories. It is recommended
that this option be enabled if the server is publicly
accessible over the Internet and the FTP_SERVER_ANONYMOUS option
has been specified. |
FTP_SERVER_LOCALTIME
(0x0020) |
This option specifies the server should return file and
directory times adjusted for the local timezone. By default, the
server will return all file times as UTC values. This option
affects the time information sent to a client when a list of
files is requested, as well as when status information is
requested for a specific file. This option will not affect the
MDTM and MFMT commands which always use file times as UTC
values. |
FTP_SERVER_LOCKFILES
(0x0040) |
This option specifies that files should be exclusively
locked when a client attempts to upload or download a file. If
another client attempts to access the same file, the operation
will fail. By default, the server will permit multiple clients
to access the same file, although it will still write-lock files
that are in the process of being uploaded. |
FTP_SERVER_HIDDENFILES
(0x0080) |
This option specifies that when a client requests a list of
files in a directory, the server should include any hidden and
system files files or subdirectories. By default, the server will
not include hidden or system files, although they are still
accessible to the client if it knows the name of the file. File
names that begin with a period are also considered to
be hidden files and will not normally be included in file
listings. |
FTP_SERVER_UNIXMODE
(0x0100) |
This option specifies the server should impersonate a
UNIX-based operating system. The server will identify itself as
running on a UNIX system and directory listings will be in a
format commonly used by UNIX. If this option is not specified,
the server will identify itself as running on Windows NT and
directory listings will be in the same format used by the
Microsoft IIS FTP server. Note that this option does not affect
the path delimiter used with file and directory names. |
FTP_SERVER_EXTERNAL
(0x0200) |
This option specifies the server is listening for
client connections from behind a router that uses Network
Address Translation (NAT). If enabled, the server will report its
external IP address rather than the address assigned to it on the
local network. For the server to accept connections
from behind a NAT router, the router must be configured to
direct inbound traffic to the specified port number on the host
system. |
FTP_SERVER_SECURE
(0x1000) |
This option specifies that secure connections using SSL
and/or TLS should be enabled. If neither the
FTP_SERVER_EXPLICIT_SSL or FTP_SERVER_IMPLICIT_SSL options are
specified, the server automatically determines the appropriate
type based on the port number. If the local port number is 990,
then implicit SSL will be used, otherwise explicit SSL will be
used. This option requires that a valid SSL certificate be
installed on the local host. |
FTP_SERVER_EXPLICIT_SSL
(0x2000) |
This option specifies the server will accept the AUTH
TLS command and negotiate a secure connection with the client
after that command is issued. This option implies the
FTP_SERVER_SECURE option and requires that a valid SSL
certificate be installed on the local host. |
FTP_SERVER_IMPLICIT_SSL
(0x4000) |
This option specifies the server should negotiate a
secure connection with the client immediately after it connects
to the server. It is recommended that you only use this option
if the server is listening for connections on port 990, which is
the standard port for FTP servers using implicit SSL. This
option implies the FTP_SERVER_SECURE option and requires that a
valid SSL certificate be installed on the local host. |
FTP_SERVER_SECURE_FALLBACK
(0x8000) |
This option specifies the server should permit the use of
less secure cipher suites for compatibility with legacy clients. If
this option is specified, the server will allow connections using
TLS 1.0 and cipher suites that use RC4, MD5 and SHA1. |