Bug ID 579926: HTTP starts dropping traffic for a half-closed connection when in passthrough mode

Last Modified: Jul 18, 2026

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

Known Affected Versions:
11.5.4, 11.5.4 hf1, 11.5.4 hf2, 11.5.4 hf3, 11.5.4 hf4, 11.5.5, 11.5.6, 11.5.7, 11.5.8, 11.5.9, 11.5.10, 12.1.2, 12.1.2 hf1, 12.1.2 hf2, 12.1.3, 12.1.3.1, 12.1.3.2, 12.1.3.3, 12.1.3.4, 12.1.3.5, 12.1.3.6, 12.1.3.7, 12.1.4, 12.1.4.1, 12.1.5, 12.1.5.1, 12.1.5.2, 12.1.5.3, 12.1.6

Fixed In:
13.0.0

Opened: Mar 11, 2016

Severity: 3-Major

Symptoms

HTTP starts dropping traffic for a half-closed connection when in passthrough mode.

Impact

Incomplete data transfer to end-point, when the connection is half-closed and HTTP is in passthrough mode.

Conditions

HTTP is in passthrough mode. Traffic is flowing for a half-closed connection.

Workaround

No workaround.

Fix Information

None

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips