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Top Forums UNIX for Dummies Questions & Answers How to block FTP ,SMTP,Telnet services? Post 302452094 by zaxxon on Thursday 9th of September 2010 06:38:30 AM
Old 09-09-2010
Ok, I try again:
Your current installed ftpd and telnetd are "kerberized". They work only correct when configured against a Kerberos server. Kerberos is a authentication method where you get with your 1st login a token from the Kerberos server and need no further successful login - being called "single-sign-on".
They are not working for your ftp and telnet daemon tests. So easiest way around might be, to just install normal, plain, "un-kerberized" versions of ftpd and telnetd. I suggested some.


But keep in mind:
Generally, if you are professionally administering servers or just care about keeping data and passwords etc. secure and sowith dealing with sensitive data, you usually want to use something secure, something where the communication is encrypted.
For this purpose ssh is ideal - you can replace telnet with it. With the ssh package you also get scp, which can replace rcp. sftp can replace ftp. No one can sniff the transferred data easy or get the password which will be clear text when using non-encrypted protocols like telnet, ftp, ...
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lsb_release(1)						      General Commands Manual						    lsb_release(1)

NAME
lsb_release - print distribution-specific information SYNOPSIS
lsb_release [options] DESCRIPTION
The lsb_release command provides certain LSB (Linux Standard Base) and distribution-specific information. If no options are given, the -v option is assumed. OPTIONS
The program follows the usual GNU command line syntax, with long options starting with two dashes (`--'). A summary of options are included below. -v, --version Show the version of the LSB against which your current installation is compliant. The version is expressed as a colon separated list of LSB module descriptions. -i, --id Display the distributor's ID. -d, --description Display a description of the currently installed distribution. -r, --release Display the release number of the currently installed distribution. -c, --codename Display the code name of the currently installed distribution. -a, --all Display all of the above information. -s, --short Use the short output format for any information displayed. This format omits the leading header(s). -h, --help Show summary of options. NOTES
This is a reimplementation of the lsb_release command provided by the Free Standards Group. Any bugs are solely the responsibility of the author below. Detection of systems using a mix of packages from various distributions or releases is something of a black art; the current heuristic tends to assume that the installation is of the earliest distribution which is still being used by apt but that heuristic is subject to error. SEE ALSO
lsb(8) AUTHOR
Chris Lawrence <lawrencc@debian.org>. lsb_release(1)
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