Bug ID 779633: BIG-IP system reuses serverside TIME_WAIT connections irrespective of TMMs used

Last Modified: Sep 27, 2019

Bug Tracker

Affected Product:  See more info
BIG-IP LTM(all modules)

Known Affected Versions:
14.1.0, 14.1.0.1, 14.1.0.2, 14.1.0.3, 14.1.0.4, 14.1.0.5, 14.1.0.6, 14.1.2, 14.1.2.1, 15.0.0, 15.0.1

Opened: May 06, 2019
Severity: 3-Major

Symptoms

When reusing a serverside TIME_WAIT connection, the BIG-IP system: -- Establishes the new connection if clientside/serverside connections are on the same TMM. -- Sends a RST 'Unable to obtain local port' if clientside/serverside connections are on different TMMs.

Impact

BIG-IP system behavior is inconsistent. In one case, BIG-IP establishes the connection. In the other case, BIG-IP resets the connection.

Conditions

This happens in two scenarios: Scenario 1: -- A new serverside connection is requested that matches an existing TIME_WAIT connection (e.g., by using source-port preserve-strict in the virtual server) -- Clientside/serverside connections are on the same TMM. Scenario 2: -- Clientside/serverside connections are on different TMMs.

Workaround

None.

Fix Information

None

Behavior Change