Bug ID 430398: Inet port exhaustion with small allowed port range

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

Fixed In:
11.5.0

Opened: Sep 11, 2013

Severity: 3-Major

Related Article: K15694

Symptoms

Inet port exhaustion error messages and LSN failures even though there are available ports in the port range, if the allowed port range (max - min) is small.

Impact

client connection attempts may fail, then succeed on a retry.

Conditions

A virtual server configured with source-address-translation type LSN and - The range of allowed port numbers is small - The number of translation addresses in the pool is small.

Workaround

Expand the range of allowed ports to use for port translation and/or increase the number of translation addresses in the pool.

Fix Information

Improved search for an available port when the allowed port range is small.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips