Bug ID 438081: Large dns-express zone config may stall stats requests by GUI

Last Modified: Oct 06, 2020

Bug Tracker

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

Known Affected Versions:
11.2.1, 11.4.1

Fixed In:
11.5.0, 11.4.1 HF2, 11.2.1 HF11

Opened: Nov 16, 2013
Severity: 2-Critical
Related AskF5 Article:


If there are many zones (e.g. 1800) a stats request for all zone stats will produce a reply message too large to be sent in one attempt. zxfrd will stall on a second attempt to send and subsequent stats requests/responses will be blocked.


Web interface appears to hang waiting for zxfrd to reply.


Config with many dns-express zones. Attempt access through the web interface (however, tmsh works).


Only view zone stats through tmsh. Otherwise, if stats are hung, perform a 'bigstart restart zxfrd'.

Fix Information

Bug fixed in zxfrd to continue large response processing.

Behavior Change