Bug ID 1036013: BIG-IP systems may terminate connections prematurely when a TLS close-notify alert is received

Last Modified: Apr 11, 2023

Affected Product(s):
BIG-IP LTM(all modules)

Known Affected Versions:
15.1.0,,,,,, 15.1.1, 15.1.2,, 15.1.3,, 15.1.4, 16.0.0,, 16.0.1,,, 16.1.0, 16.1.1

Fixed In:
17.0.0, 16.1.2,

Opened: Jul 24, 2021

Severity: 3-Major


When a backend server sends a TLS close-notify alert, BIG-IP may terminate the connection prematurely without forwarding the HTTP response.


Server responses may be dropped.


ServerSSL receives a TLS Close-notify alert after a TLSv1.3 session is established.


Use TLSv1.2.

Fix Information

Do not abort connection immediately after receiving TLS Close-notify alert.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips