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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: 52,844
    01-11-2010 Go to last post
  1. 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: 592
    09-02-2010 Go to last post
  2. 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: 12,091
    08-31-2010 Go to last post
  3. 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, 08-29-2010
    • Replies: 4
    • Views: 817
    08-29-2010 Go to last post
  4. 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: 4,201
    08-20-2010 Go to last post
  5. 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: 4,893
    08-20-2010 Go to last post
  6. 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: 935
    08-17-2010 Go to last post
  7. 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, 08-16-2010
    • Replies: 4
    • Views: 4,264
    08-17-2010 Go to last post
  8. 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: 7,501
    08-16-2010 Go to last post
  9. 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: 2,154
    08-16-2010 Go to last post
  10. 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: 1,568
    08-14-2010 Go to last post
  11. 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: 838
    08-13-2010 Go to last post
  12. 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: 2,439
    08-09-2010 Go to last post
  13. 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: 4,209
    08-09-2010 Go to last post
  14. 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: 767
    08-05-2010 Go to last post
  15. 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: 11,122
    08-03-2010 Go to last post
  16. How do you do bock spoofing attack, invalid packets and other?

    How do you do bock spoofing attack, invalid packets and other? Please, post you code for iptables.

    Started by wertum, 07-27-2010
    • Replies: 1
    • Views: 836
    08-03-2010 Go to last post
  17. Server infected with scanssh, pscan2, ./sshf. Urgent Help Required

    HI Gurus, I am facing a security issue on my server. I can see many process like pscan2, scanssh and ./sshf processing on 'top'. The owner of...

    Started by Xaeem, 07-31-2010
    • Replies: 2
    • Views: 5,485
    08-02-2010 Go to last post
  18. Running services as specific users

    Hi guys, I'm not new to Linux but no expert by any means and currently I'm running Gentoo. Something I've always wondered about is how you go about...

    Started by FunkyMcBain, 08-01-2010
    • Replies: 4
    • Views: 1,131
    08-02-2010 Go to last post
  19. Linux and malware

    Hi! I am completly new to Linux, and this is my first thread on this forum. We have a network at my job that needs to be completly offline due...

    Started by hovmedia, 07-30-2010
    • Replies: 1
    • Views: 738
    07-30-2010 Go to last post
  20. Write Permisson Denied

    I created a user "CATUSER" and using the usermod command I had set the secondary group of the "CATUSER" to "beagrp". usermod -a -G beagrp CATUSER...

    Started by balamuruganmurthy, 07-28-2010
    • Replies: 2
    • Views: 929
    07-29-2010 Go to last post

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