# [OmniOS-discuss] WARNING: High TCP connect timeout rate! System (port 80) may be under a SYN flood attack!

Bob Friesenhahn bfriesen at simple.dallas.tx.us
Tue Mar 28 13:43:01 UTC 2017

- Previous message: [OmniOS-discuss] Fwd: SMB file locking problem in r151020 vs r151012
- Next message: [OmniOS-discuss] WARNING: High TCP connect timeout rate! System (port 80) may be under a SYN flood attack!
- Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

    Since updating OmniOS to r151020, I have been seeing many "SYN flood
    attack!" warnings on the system console.  I never saw these before.

    Has something changed in the TCP/IP stack which now produces these
    warnings or has my server been co-incidentally targeted for SYN flood
    attacks and was not targeted before?

    Are other users seeing these warnings?

    I have 45 such alerts posted since Febrary 27 (in the
    /var/adm/messages* files).

    Bob
    --
    Bob Friesenhahn
    bfriesen at simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
    GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/

- Previous message: [OmniOS-discuss] Fwd: SMB file locking problem in r151020 vs r151012
- Next message: [OmniOS-discuss] WARNING: High TCP connect timeout rate! System (port 80) may be under a SYN flood attack!
- Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

More information about the OmniOS-discuss mailing list