Linux - NewbieThis Linux forum is for members that are new to Linux.
Just starting out and have a question?
If it is not in the man pages or the how-to's this is the place!
Welcome to LinuxQuestions.org, a friendly and active Linux Community.
You are currently viewing LQ as a guest. By joining our community you will have the ability to post topics, receive our newsletter, use the advanced search, subscribe to threads and access many other special features. Registration is quick, simple and absolutely free. Join our community today!
Note that registered members see fewer ads, and ContentLink is completely disabled once you log in.
If you have any problems with the registration process or your account login, please contact us. If you need to reset your password, click here.
Having a problem logging in? Please visit this page to clear all LQ-related cookies.
Introduction to Linux - A Hands on Guide
This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started guide, with exercises at the end of each chapter.
For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration. This book contains many real life examples derived from the author's experience as a Linux system and network administrator, trainer and consultant. They hope these examples will help you to get a better understanding of the Linux system and that you feel encouraged to try out things on your own.
Click Here to receive this Complete Guide absolutely free.
Where are you logging in from? Did you run "ssh -X <user>@<hostname>"? You need to use the -X option. If you are logging in using putty, then you need to enable X forwarding and install an X server on windows (such as Cygwin/X). You also need to allow X forwarding in the /etc/ssh/sshd_config file. Ssh sets up a proxy connection using "local:10.0".
Reading though the /etc/ssh/sshd_config file and the sshd_config manpage would be a good idea. You will want to only allow protocol 2 and use "AllowUsers" or "AllowGroups" to disallow all others. The config file is well commented. You can learn how to configure public key authentication by reading the comments above the "UsePam yes" line.
Allowing root logins is a bad idea. It should only be allowed for unattended servers that use ssh for syncing or a cron backup job. And then, you should configure public key authentication and disallow root logins. Root is a known user and the most popular target of brute force attacks. For working manually, one should log in as a regular user and then use sudo or "su -".