Please whitelist cPanel in your adblocker so that you’re able to see our version release promotions, thanks!

The Community Forums

Interact with an entire community of cPanel & WHM users!

kernel: possible SYN flooding on port 80. Sending cookies.

Discussion in 'Security' started by ukagg, Dec 20, 2010.

  1. ukagg

    ukagg Active Member

    Joined:
    Aug 14, 2002
    Messages:
    35
    Likes Received:
    0
    Trophy Points:
    156
    Hi,

    Looks like my server is under ddos attack.

    Apache keeps failing.

    /var/log/messages shows following:-

    Dec 20 23:18:11 ns4 kernel: possible SYN flooding on port 80. Sending cookies.
    Dec 20 23:19:11 ns4 kernel: possible SYN flooding on port 80. Sending cookies.
    Dec 20 23:20:14 ns4 kernel: possible SYN flooding on port 80. Sending cookies.
    Dec 20 23:21:15 ns4 kernel: possible SYN flooding on port 80. Sending cookies.

    I have already enabled Connection Tracking (CT_LIMIT = 120) in CSF firewall, but still attack continues. Can someone help.

    Thanks
    UKA
     
    #1 ukagg, Dec 20, 2010
  2. GaryT

    GaryT Well-Known Member

    Joined:
    May 19, 2010
    Messages:
    320
    Likes Received:
    3
    Trophy Points:
    68
    In CSF config Look for:

    SYNFLOOD = 1
     
    #2 GaryT, Dec 22, 2010
(You must log in or sign up to post here.)
Loading...
Similar Threads - kernel possible flooding
  1. cPanelMichael

    InnoDB fails to start on systems using MariaDB 10.1.34 when the kernel is older than 2.6.24

    cPanelMichael, Jun 20, 2018 at 3:42 PM, in forum: General Discussion
    Replies:
    0
    Views:
    68
    cPanelMichael
    Jun 20, 2018 at 3:42 PM
  2. Lillike

    Kernel does not support the prevention of symlink ownership attacks

    Lillike, Jun 20, 2018 at 9:08 AM, in forum: Security
    Replies:
    1
    Views:
    40
    cPanelLauren
    Jun 20, 2018 at 12:03 PM
  3. Nirjonadda

    KernelCare's Free Patch Set

    Nirjonadda, Jun 6, 2018, in forum: EasyApache
    Replies:
    7
    Views:
    81
    cPanelLauren
    Jun 6, 2018
  4. toplisek

    Updating Kernel version question

    toplisek, May 25, 2018, in forum: Security
    Replies:
    2
    Views:
    78
    cPanelMichael
    May 25, 2018
  5. gfserver

    WHM 70.0.44 You must reboot the server to apply kernel updates

    gfserver, May 24, 2018, in forum: General Discussion
    Replies:
    6
    Views:
    195
    gfserver
    May 25, 2018

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.
    Accept Learn More...
    Dismiss Notice