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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: 51,524
    01-11-2010 Go to last post
  1. [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: 4,311
    09-17-2010 Go to last post
  2. 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: 1,031
    09-15-2010 Go to last post
  3. 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: 438
    09-14-2010 Go to last post
  4. 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: 1,452
    09-13-2010 Go to last post
  5. 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: 1,016
    09-07-2010 Go to last post
  6. 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: 530
    09-02-2010 Go to last post
  7. 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: 11,557
    08-31-2010 Go to last post
  8. 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: 743
    08-29-2010 Go to last post
  9. 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: 4,018
    08-20-2010 Go to last post
  10. 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: 4,644
    08-20-2010 Go to last post
  11. 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: 860
    08-17-2010 Go to last post
  12. 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: 4,036
    08-17-2010 Go to last post
  13. Every port is open!

    ok, so I just port scanned this server, and it is showing that just about every port is open. Are all these ports really open? or is this some kind...

    Started by xilus, 08-16-2010
    • Replies: 5
    • Views: 7,096
    08-16-2010 Go to last post
  14. Iptables Configuration Problem

    Hey everybody I've read this forum for a while now, but never here goes post #1. I am trying to create a simple iptables configuration...

    Started by parihar, 08-03-2010
    2 Pages
    1 2
    • Replies: 11
    • Views: 2,047
    08-16-2010 Go to last post
  15. Issues with selinux

    Hello, I have very strange things with selinux. My post may be will bit disordered, because I'm not completely understand what is going on. Before...

    Started by rodnower, 08-09-2010
    • Replies: 1
    • Views: 1,403
    08-14-2010 Go to last post
  16. Nmap

    Hi, What I'm trying to do is avoid the detection of nmap. So when I run some of this : nmap -PN nmap -v -f ...

    Started by Blackzer, 07-12-2010
    • Replies: 2
    • Views: 774
    08-13-2010 Go to last post
  17. Question Snort Important Rules

    hello all, Iíve installed fwsnort on a linux server it uses snort rules and include them to the iptables. I can use fwsnort to load specific...

    Started by george87, 08-08-2010
    • Replies: 1
    • Views: 2,260
    08-09-2010 Go to last post
  18. How one gets infected with a rootkit, virus, trojan, etc, on linux?

    Can something like that happen just by browsing, like bypassing those warnings by google? Most of windows viruses I know (well, I don't even know...

    Started by the dsc, 08-02-2010
    • Replies: 4
    • Views: 4,095
    08-09-2010 Go to last post
  19. Linux Firewall (IPTABLES)

    HI! I have worked a lot at iptables and deployed it in my office working environment. I have no issue in deployment and configuration. Anybody...

    Started by fnregister, 08-03-2010
    • Replies: 1
    • Views: 697
    08-05-2010 Go to last post
  20. User account locking not working in Pam

    Hi I am facing another problem while configuring the system-auth file for setting user account locking after 3 fail attempts. But this...

    Started by cj_cheema, 07-25-2010
    • Replies: 7
    • Views: 10,722
    08-03-2010 Go to last post

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