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How do you disable users from using TELNET to log in to a specific
machine (i.e., server)? And is it possible to allow some users to TELNET
to a specific machine and some not?
--
Ethan Bambock, ebambock@hotmail.com
You can disable TELNET in the /etc/inetd.conf file.
Look at the /etc/security/access.conf file to allow access on a per-user
basis.
--
Marc Merlin, marc@merlins.org
[See also man pages for hosts_access(5) and hosts_options(5). --Ed.]
I cannot seem to get the FTP server/service to work. When I
attempt to use ftp to access the Red Hat machine from another
computer, I get the message
``connection is closed by the remote host''. It won't
even give me the opportunity to type in a name or anything.
I have not had this problem with previous Linux versions.
I am on a Gateway Pentium 133 on a 16MB token-ring network. Incidentally,
using TELNET works fine.
--
Steve Mitchell, mitchells@co.monterey.ca.us
There are two possible answers to this problem, depending on the FTP client you are using.
If you are using NcFTP, and you are not forcing it to ask you for a user name and password with -u, it will automatically try to log in as root, if you are logged in as root locally. Most distributions of Linux prevent root logins via FTP for security. You can change this by editing /etc/ftpusers, which is a list of users who may not log in via FTP.
If you are not using NcFTP, the service is either not installed
or not correctly configured on the remote server. This is less likely
to be the
problem, and you can test it by trying to connect from another machine
on the local network, as opposed to your home system. In this case,
inetd (the service that handles incoming connections and spawns
the handler daemons) is either not finding ftpd where it has been
told to look or is not
able to start the process for some reason. inetd is configured via
/etc/inetd.conf, and you may want to look at that file to see if the FTP
service is commented out.
--
Chad Robinson, chadr@brt.com
It sounds to me as if Linux is not seeing all of your memory. You should verify that it is all there with the command free. The total column will indicate how much is recognized. If it does not show (in kilobytes) close to 64MB, you must specifically tell Linux there are 64MB. This is done at boot time, so you must edit /etc/lilo.conf and add the line append = "mem=64M" to the options. Then run lilo from the command prompt and reboot.
One other thing could cause problems. Some BIOS revisions
come with an option for ``Memory Hole at 15M'',
which you should disable. This option is for OS/2, so unless you
are running OS/2 you do not need it.
--
Andy Bradford, andyb@calderasystems.com
I don't know about the slowdown, but Lynx does support proxies!
Look for the file lynx.cfg; it has examples
of how to set up a proxy right in the comments.
--
David M. Brown, david@calderasystems.com
Sometimes when I am installing an RPM
package, I get messages saying the package is already installed and
cannot install; however, when I run the rpm -q
to query the package, it says
it is not installed. I need certain packages such as Perl that
I cannot get installed and do not work. Please help!
The frustration is setting in.
--
Carlo Wise, 141618@bellsouth.net
Try using rpm -qa | grep perl to list
all the packages
that might be installed with the name of perl. You can obviously
change ``perl'' to whatever package name you are looking for.
--
Andy Bradford, andyb@calderasystems.com
There is some confusion at times as to the distinction
between a package name and an RPM file name. There is a difference!
When you wish to install an RPM, you use the RPM file name, e.g.:
rpm -ivhwhere filename-2.0-1.i386.rpm is the actual RPM file name. When you wish to reference an installed RPM, you must use the package name (with or without the version information), e.g.:
rpm -q filenameor
rpm -q filename-2.0-1In this case, rpm -q filename-2.0-1.i386.rpm will not work, as that is not the package name.
In your installation CD is a User's Guide rpm
which addresses a lot of questions, especially for beginners.
For your printer problem (assuming that is already connected to the parallel
port):
Rather then answer your questions directly, I propose an entirely
different solution. When checking your e-mail, just make sure you
``leave mail on server''. Most clients support this. I have
set up many a
corporate employee who wanted to synchronize their e-mail on a laptop
with their e-mail on a desktop computer.
--
Mark Bishop, mark@bish.net
I recommend using an IMAP-compatible client to retrieve
your e-mail. Pine,
Netscape, Outlook Express and many other mail clients support the IMAP
protocol. The benefit of using IMAP is that your folders are kept on the
server, so your client does not need to store this information
locally and attempt to share it with other clients. I do this with Pine
under Linux and Outlook Express in Windows and have been quite happy
with the results. Just be sure you refresh your folder lists frequently,
as most clients will not do this automatically and will miss updates
made in other clients.
--
Chad Robinson, chadr@brt.com
I'm a beginner. After creating the boot disk using rawrite with boot.img as its source, I tried to boot using the diskette. After I pressed <ENTER>, my PC froze. Here is the last line of the message:
RAMDISK : Compressed image found at block 0 CRC errorVFS : Cannot open root device 08:22 kernel panic : VFS:Unable to mount rootfs on 08:22Help.
Use a pair of brand-new floppy disks, and this problem
should go away.
The compressed file system placed on the root disk consumes almost all
the disk, and any errors on the disk will cause this problem. Usually,
replacing the disk with a fresh floppy will solve the problem. The
worst-case scenario is a bad floppy drive, but that is unusual.
--
Chad Robinson, chadr@brt.com
I cannot remove LILO from my Master Boot Record. Even
reformatting the drive completely back to a Windows FAT 16 configuration
doesn't help. A fragment of LILO somehow remains and tries to boot a
nonexistent LINUX system, denying me access to Windows, and freezing
the system. How can I completely delete LILO from my MBR?
--
Robert Morgan, rcm612@prodigy.net
There are ways of restoring your original MBR, but since
the drive has been formatted, that is not an option. Another method
is to first boot from a DOS boot floppy or Win95 rescue diskette.
Then run fdisk /mbr which will write a new MBR.
--
David M. Brown, david@calderasystems.com
Many on-line help resources are available on the SSC web pages. Sunsite mirror sites, FAQs and HOWTOs can all be found at http://www.linuxresources.com/.
Answers published in Best of Technical Support are provided by a team of Linux experts. If you would like to submit a question for consideration for use in this column, please fill out the web form at http://www.linuxjournal.com/techsup.html or send e-mail with the subject line ``BTS'' to Ellen Dahl at bts@ssc.com.