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

Last Modified: Nov 07, 2022

Bug Tracker

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

Known Affected Versions:
16.0.0, 16.0.0.1, 16.0.1, 16.0.1.1, 16.0.1.2, 16.1.0, 16.1.1, 16.1.2, 16.1.2.1

Fixed In:
17.0.0, 16.1.2.2

Opened: May 21, 2021
Severity: 3-Major

Symptoms

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

Impact

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

Conditions

-- 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

Workaround

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

None

Behavior Change