Last Modified: Jun 13, 2019
See more info
Known Affected Versions:
14.1.0, 184.108.40.206, 220.127.116.11, 18.104.22.168, 22.214.171.124, 126.96.36.199, 188.8.131.52, 15.0.0
Opened: Jun 04, 2019
'TCP half open' reports drops in logs/tmctl/AVR even though it is configured in detect-only mode.
It will appear that 'TCP half open' is doing mitigation, but it is actually LTM syn-cookies dropping the connections.
-- 'TCP half open' attack is being actively detected. -- LTM syn-cookie mitigation is enabled. -- This is triggered when LTM syn-cookies mitigation begins.
If LTM syn-cookies are not needed, disable the option: modify ltm global-settings connection default-vs-syn-challenge-threshold infinite global-syn-challenge-threshold infinite