Bug ID 647158: Internal virtual server inherits CMP hash mode from parent virtual server

Last Modified: Apr 19, 2021

Bug Tracker

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

Known Affected Versions:
12.1.0, 12.1.0 HF1, 12.1.0 HF2, 12.1.1, 12.1.1 HF1, 12.1.1 HF2, 12.1.2, 12.1.2 HF1, 12.1.2 HF2, 12.1.3,,,,,,,, 12.1.4,, 12.1.5,,,, 12.1.6, 13.0.0, 13.0.0 HF1, 13.0.0 HF2, 13.0.0 HF3, 13.0.1

Fixed In:

Opened: Feb 23, 2017
Severity: 3-Major
Related AskF5 Article:


An internal virtual server might behave in unexpected ways, such as abort a client connection before connecting to the server.


The internal virtual server might sometimes abort when attempting to make a connection to the server. This occurs after a successful load-balance pick indicated by the LB_SELECTED event, but before a TCP SYN packet is sent to the server. As a result the parent virtual performs the service-down-action configured in the request-adapt or response-adapt profile.


Virtual server with request-adapt or response-adapt profile and a vlan with 'cmp-hash' mode 'src-ip'. Internal virtual server without a VLAN or 'cmp-hash' setting.


If possible, do not use the cmp-hash mode 'src-ip'.

Fix Information

An internal virtual server is not affected by any 'cmp-hash' mode setting in the parent virtual server.

Behavior Change