Bug ID 420341: Connection Rate Limit Mode when limit is exceeded by one client also throttles others

Last Modified: Apr 28, 2025

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

Known Affected Versions:
11.3.0, 11.4.0, 11.4.1, 11.5.0, 11.5.1, 11.5.1 HF1, 11.5.1 HF2, 11.5.1 HF3, 11.5.1 HF4, 11.5.1 HF5, 11.5.1 HF6, 11.5.1 HF7, 11.5.1 HF8, 11.5.1 HF9, 11.5.1 HF10, 11.5.1 HF11, 11.5.2, 11.5.2 HF1, 11.5.3, 11.5.3 HF1, 11.6.0, 11.6.0 HF1, 11.6.0 HF2, 11.6.0 HF3, 11.6.0 HF4, 11.6.0 HF5

Fixed In:
12.0.0, 11.6.0 HF6, 11.5.3 HF2, 11.4.1 HF9

Opened: May 01, 2013

Severity: 1-Blocking

Related Article: K17082

Symptoms

Connection Rate Limit Mode is set to Per Virtual Server and Source Address, you might encounter unexpected results. Once a particular client is above the limit, other clients (other source IP addresses) are also throttled by the system.

Impact

The virtual server throttles clients that are not exceeding the connection rate limit.

Conditions

This occurs in the following manner: There is a configured connection rate limit per virtual server per client; one client exceeds the configured rate limit; and the virtual server also throttles other, unrelated clients.

Workaround

None.

Fix Information

Connection Rate Limit Mode when limit is exceeded by one client no longer throttles others.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips