Bug ID 2015973: Enabling tcp-ak-ts dos vector causes file transfer failure

Last Modified: Aug 14, 2025

Affected Product(s):
BIG-IP AFM, Install/Upgrade(all modules)

Known Affected Versions:
17.1.2.1, 17.1.2.2

Opened: Aug 10, 2025

Severity: 3-Major

Symptoms

After upgrading, large file transfers to S3 endpoints start failing

Impact

TLS connections to S3 endpoints are disrupted, resulting in stalled or failed connections

Conditions

-- Tcp-ack-ts with tscookie is enabled -- You transfer a large file via the virtual server

Workaround

Disable the tscookie option in tcp-ack-ts

Fix Information

None

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips