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Forum: Security

Post here for help with Linux security issues: antivirus, firewalls, encryption, vulnerabilities, etc

  1. Sticky Thread Sticky: A short guide to Linux security

    Here at we are often asked about the potential threat of a virus or malware attack. This short guide is designed to answer some of...

    Started by fingal, 02-25-2006
    • Replies: 1
    • Views: 73,160
    01-11-2010 Go to last post
  1. Control access to folder both from ssh and ftp.

    Dear All, I would like to create new user where there can both ftp and also ssh to my server. The problem when they login either via...

    Started by newbie14, 10-05-2010
    • Replies: 6
    • Views: 1,767
    10-07-2010 Go to last post
  2. Cool rarcrack installed on Fedora 13

    Greetings, I had trouble remembering a password for an old compressed file and ran into this piece of software: RarCrack! It is fantastic but a...

    Started by daacosta, 10-07-2010
    • Replies: 0
    • Views: 3,342
    10-07-2010 Go to last post
  3. fail2ban not working in CentOS

    I've been trying to fix fail2ban for a while didn't want to bother anyone with the problem but haven't been able to figure whats wrong. I'm using...

    Started by Cendent, 09-25-2010
    • Replies: 9
    • Views: 15,123
    10-02-2010 Go to last post
  4. Sticky Bits

    I noticed a few files in /usr/bin have the a stickybit set sudo sudoedit newgrp passwd mtr gpasswd are they supposed to have a stickybit...

    Started by xilus, 09-29-2010
    • Replies: 1
    • Views: 1,004
    09-30-2010 Go to last post
  5. How to control folder access both via ftp and ssh?

    Dear Scortto, What I would like do first to add new user and allow new user to both actually ftp and ssh to my server. The...

    Started by newbie14, 09-29-2010
    • Replies: 0
    • Views: 1,153
    09-29-2010 Go to last post
  6. Odd UDP Traffic - VoIP Server

    Not sure what's going on here, but I can't seem to figure out which process is generating this traffic. Couple of questions: 1. How do I trace...

    Started by deftx, 09-20-2010
    • Replies: 3
    • Views: 2,630
    09-29-2010 Go to last post
  7. [auditd] when killed then kauditd logs to the console tty (?)

    Hello, I've watched that when auditd is killed, every log message is then copied to the console tty. Is it normal and is it any way to change this...

    Started by flatplane, 09-27-2010
    • Replies: 5
    • Views: 7,651
    09-28-2010 Go to last post
  8. What does this Firestarter log mean?

    Firestarter's log this morning... (Ubuntu 910)... Time:Sep 21 07:02:15 Direction: Unknown In:eth0 Out: Port:445 Source: Destination:...

    Started by cosmicbrat, 09-21-2010
    • Replies: 0
    • Views: 1,469
    09-21-2010 Go to last post
  9. [Debian Testing] Iptables makes system slow

    Hi, I configured an iptables and I don't dare to make it permanent because when I activate it my system becomes very slow. For example when I...

    Started by Keessince1988, 09-15-2010
    • Replies: 6
    • Views: 5,860
    09-17-2010 Go to last post
  10. Issue with pf > iptables rule translation

    Hi, Following a migration of my network from FreeBSD to Linux, I'm attempting to translate some PF rules into iptables syntax. The following...

    Started by enderwiggin, 09-15-2010
    • Replies: 0
    • Views: 1,349
    09-15-2010 Go to last post
  11. Remotely decrypting a server

    Hi folks, I have a tricky one here where i need to find a way to securely authenticate a decryption mechanism of some sort where the...

    Started by Phier, 09-12-2010
    • Replies: 1
    • Views: 767
    09-14-2010 Go to last post
  12. Guarddog Iptables help reading logs please

    Hey guys, please can you tell me what the following means? ABORTED IN=eth0 OUT= MAC=00:1b:24:af:dc:a4:00:30:bd:6d:58:aa:08:00 SRC=

    Started by Chris1989, 08-15-2010
    • Replies: 1
    • Views: 1,956
    09-13-2010 Go to last post
  13. Smile block an ip permanent do illegal ssh on my server

    how to block an IP do illegal ssh on my server? some one do brute shh to login my root.. I read old posted in this forum use this method: or ...

    Started by wempiebre, 09-07-2010
    • Replies: 3
    • Views: 1,302
    09-07-2010 Go to last post
  14. issue in denyhost

    Hi, i am using denyhost software my OS is redhat linux 4.2 and python version i amusing is 2.4.1.i was installed the denyhosts...

    Started by rmnaidu, 09-02-2010
    • Replies: 0
    • Views: 843
    09-02-2010 Go to last post
  15. Iptables and SYN-FLOOD attack

    Dear all, I've 2 problem with my new network infrastructure (I think!) I show you a basic plan of my network. First problem: Sometimes I lost...

    Started by Mouglou, 08-16-2010
    2 Pages
    1 2
    • Replies: 17
    • Views: 14,796
    08-31-2010 Go to last post
  16. Am I under attack?

    I've recently installed Firestarter Firewall on my Ubuntu Desktop and Laptop. Since then I have noticed that on my desktop the events page of...

    Started by Jonny87, 08-28-2010
    • Replies: 4
    • Views: 1,075
    08-29-2010 Go to last post
  17. how to log all the commands executed by root

    Hi I want to get a of log all the commands executed by the root user with the following details : incoming ip username (thru which su was...

    Started by me_spearhead, 08-11-2010
    • Replies: 5
    • Views: 4,818
    08-20-2010 Go to last post
  18. Iptables internet access problem

    I have a problem with a iptables firewall, if I use this file below I have limited internet access. ie I can't use or as a...

    Started by codge, 08-18-2010
    • Replies: 5
    • Views: 6,101
    08-20-2010 Go to last post
  19. block particular web site form multiple site hosted web server and allow others

    Dear All, I am having a web server (apache) hosted with 3 web sites, named as, and I need to restrict...

    Started by all2dark, 08-17-2010
    • Replies: 2
    • Views: 1,263
    08-17-2010 Go to last post
  20. Rkhunter log - loads of warnngs

    I have only just re-installed my copy of Ubunutu and wanted to tighten up on security so i got Rkhunter and here is the output log of my first run. ...

    Started by Chris1989, 08-15-2010
    • Replies: 4
    • Views: 5,126
    08-17-2010 Go to last post

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