Bug ID 459409: Zero Window timeout on internal VIP cannot be modified

Last Modified: Sep 13, 2023

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

Known Affected Versions:
11.4.0, 11.4.1, 11.5.0, 11.5.1, 11.5.2, 11.5.3, 11.5.4, 11.5.5, 11.5.6, 11.5.7, 11.5.8, 11.5.9, 11.5.10, 12.1.0 HF1, 12.1.0 HF2, 12.1.1 HF1, 12.1.1 HF2, 12.1.2 HF1, 12.1.2 HF2

Fixed In:
12.0.0

Opened: Apr 28, 2014

Severity: 3-Major

Symptoms

The Zero Window timeout property of the TCP profile cannot be modified on an internal virtual IP, like the one used by APM hosted content.

Impact

If a large file is hosted on APM client, there is a chance that the TCP window will fill up on a slow connection, and after 20 seconds of zero window, the connection will be reset.

Conditions

Any internal VIP.

Workaround

None.

Fix Information

The TCP configuration for HTTP forwarding internal virtual server can now be modified using these TCP profiles: 1. apm-forwarding-client-tcp for client-side connections and 2. apm-forwarding-server-tcp for server-side connections.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips