My redhat 6.0 FTP service is not up.
if I type : ftp localhost
it will say: 421 Service not available, remote server has closed connection

I checked inetd.conf:
ftp     stream  tcp     nowait  root    /usr/sbin/tcpd  in.ftpd -l -a

in services:
ftp             21/tcp

But I can't find in.ftpd anywhere. Do I need to install some module?

Please help.
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the IF you don't find the in.ftpd (usually in /usr/sbin/), try installing for example the wu-ftpd package.
According to rfc969 this means:

421 Service not available, closing control connection.
This may be a reply to any command if the service knows it must shut down.

In essense you haven't even gotton to login.  services file is correct, because 21 is usually the port used for ftp.

in.ftpd is the Internet File Transfer Protocol server which comes with the wu-ftpd package, yes, you will need this server in order to have ftp services. Get the package, and make sure you also have the tcpd wrapper program installed, too, and your problem should be solved.

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