Bug ID 1182553: AFM blocks APM OAuth loopback call

Last Modified: Jan 06, 2023

Bug Tracker

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

Known Affected Versions:
15.1.0,,,,,, 15.1.1, 15.1.2,, 15.1.3,, 15.1.4,, 15.1.5,, 15.1.6,, 15.1.7, 15.1.8,

Opened: Oct 20, 2022
Severity: 3-Major


The OAuth protocol requires that the APM perform a loopback call to itself in order to pull details of a user. The packets sent by APM when sent over _loopback VLAN are being rejected by the default AFM rule. The _loopback is a non-configurable VLAN in firewall rules.


The OAuth virtual server is not working.


-- APM is enabled. -- AFM is enabled.


The _loopback is a non-configurable VLAN in firewall rules. Recommended workaround is to block all user-configured VLANs in the penultimate rule and then allow all in the last rule. This is less than ideal and would be prone to user error.

Fix Information


Behavior Change