For more information regarding the security incident at F5, the actions we are taking to address it, and our ongoing efforts to protect our customers, click here.

Forum Discussion

biglouie_9849's avatar
biglouie_9849
Icon for Nimbostratus rankNimbostratus
Oct 11, 2012

F5 LCD displaying "Blocking DOS attack"

Not sure if I'm posting this in the correct forum, apologies if not.     We have an Active/Standby cluster of 2 F5 Bigip 1600's running 9.4.7.     Recently we noticed the Standby F5 i...
app sec
BIG-IP Access Policy Manager (APM)
security
What_Lies_Bene1's avatar
What_Lies_Bene1
Icon for Cirrostratus rankCirrostratus
Oct 11, 2012
I found these links on a post Hoolio had responded to back in 2011 that might help. The error is triggered when LTM runs low on memory. I suspect the standby is running low on memory due to a code bug and I'd suggest a reboot might fix this issue;

 

 

sol4611: Overview of adaptive reaping

 

http://support.f5.com/kb/en-us/solutions/public/4000/600/sol4611.html

 

 

sol7301: Protecting the BIG-IP LTM against denial of service attacks

 

http://support.f5.com/kb/en-us/solutions/public/7000/300/sol7301.html