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Old 09-30-2006, 01:07 PM   #1
Registered: Jun 2006
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Network Services

Running Linux Enterprise 4
How do you disable FTP and enable SFTP?
How do you disable telnet?
Old 09-30-2006, 01:47 PM   #2
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Running Linux Enterprise 4
Is that Red Hat?
How do you disable FTP and enable SFTP?
in a terminal
man ftp
man sftp
How do you disable telnet?
1. Type sudo nano /etc/xinetd.d/telnet
2. Look for the line: disable = no and replace with disable = yes
3. Save it.
4. Now restart the inetd service: /etc/rc.d/init.d/xinetd restart
5. Turn it off through chkconfig as well because it can still start through that.
/sbin/chkconfig telnet off
6. Scan your server to ensure port 23 is closed. nmap -sT -O localhost
Also run ps -aux | grep telnet and if you find anything other than "grep telnet" as result kill the process.
Old 09-30-2006, 05:16 PM   #3
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Also, most distros have not had telnet enabled for some time now, at least several years. You can use the telnet client to check ports, like "telnet localhost 25" to see if the server is accepting SMTP communications, but straight "telnet localhost" won't work, unless you enabled it.

jim@jimsworktop:~$ telnet localhost
telnet: Unable to connect to remote host: Connection refused
As for ftp and sftp, sftp is actually built into ssh, and most of the time it "just works", meaning the default operation of ssh allows sftp. In my /etc/ssh/sshd_config I see this line:

Subsystem sftp /usr/lib/openssh/sftp-server
If you have the same sftp-server file, and sftp isn't working, adding that line to your sshd_config file and restarting the ssh service should allow it.

Regular ftp can probably be disabled using the scripts in /etc/rc.d/init.d/, or I believe all the Red Hat distros still use a utility with the name chkconfig? If so, some command like chkconfig ftp off will probably do the trick.



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