[grsec] Message explanation

[azurIt]

Hi,

can anyone, please, explain this message? Never saw it until yesterday, no luck with Google.

Dec 10 02:03:29 server01 kernel: [  220.366486] grsec: From 141.105.120.152: bruteforce prevention initiated for the next 30 minutes or until service restarted, stalling each fork 30 seconds.  Please investigate the crash report for /usr/lib/apache2/mpm-itk/apache2[apache2:3586] uid/euid:1258/1258 gid/egid:100/100, parent /usr/lib/apache2/mpm-itk/apache2[apache2:2142] uid/euid:0/0 gid/egid:0/0

Thank you!

azurIt