Bug ID 1020549: Server-side connections stall with zero window with OneConnect profile

Last Modified: Feb 07, 2024

Affected Product(s):
BIG-IP TMOS(all modules)

Known Affected Versions:
16.0.0,, 16.0.1,,, 16.1.0, 16.1.1, 16.1.2,

Fixed In:

Opened: May 21, 2021

Severity: 3-Major


Serverside connections from pool member to BIG-IP hang, with the BIG-IP advertising a TCP zero window.


Serverside connections hang in the middle of data transfer, and will eventually time out.


-- Virtual server with OneConnect profile -- The BIG-IP applies flow-control to the serverside connection (e.g. the server's response to the BIG-IP is faster than the BIG-IP's forwarding the response to the client) -- The serverside connection is subsequently re-used


If possible, remove the OneConnect profile from the virtual server. Note: removing a OneConnect profile may cause problems with persistence, as described in K7964: The BIG-IP system may appear to ignore persistence information for Keep-Alive connections (https://support.f5.com/csp/article/K7964)

Fix Information


Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips