Last Modified: Apr 28, 2025
Affected Product(s):
BIG-IP Install/Upgrade
Known Affected Versions:
13.0.0, 13.0.0 HF1, 13.0.0 HF2, 13.0.0 HF3, 13.0.1, 13.1.0, 13.1.0.1, 13.1.0.2, 13.1.0.3, 13.1.0.4, 13.1.0.5, 13.1.0.6, 13.1.0.7, 13.1.0.8, 13.1.1, 13.1.1.2, 13.1.1.3, 13.1.1.4, 13.1.1.5, 14.0.0, 14.0.0.1, 14.0.0.2, 14.0.0.3, 14.0.0.4, 14.0.0.5, 14.0.1, 14.0.1.1, 14.1.0, 14.1.0.1, 14.1.0.2, 14.1.0.3, 14.1.0.5, 14.1.0.6, 14.1.2, 14.1.2.1, 14.1.2.2, 14.1.2.3, 14.1.2.4, 15.0.0, 15.0.1, 15.0.1.1, 15.0.1.2
Fixed In:
15.1.0, 15.0.1.3, 14.1.2.5, 13.1.3
Opened: Apr 10, 2019 Severity: 3-Major
The system does not roll forward the FastL4 profile syn-cookie-enable attribute after upgrading from 12.x to 13.x and beyond.
If syn cookies are explicitly disabled on a FastL4 profile prior to upgrading, they may be enabled. FastL4 profiles with default values for "hardware-syn-cookie" (enabled) and "software-syn-cookie" (disabled) prior to upgrading will have "syn-cookie-enable" set to "disabled" on first boot after upgrading.
This happens when upgrading from 12.x to 13.x and beyond.
You can fix the configuration by modifying it manually after upgrading. In tmsh: tmsh modify ltm profile fastl4 <profile_name> syn-cookie-enable <enabled|disabled>
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