Bug ID 863401: QUIC congestion window sometimes increases inappropriately

Last Modified: Nov 22, 2021

Bug Tracker

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

Known Affected Versions:
15.1.0,,,,,, 15.1.1, 15.1.2

Fixed In:

Opened: Dec 18, 2019
Severity: 4-Minor


When QUIC is discovering the link bandwidth, it sometimes increases the congestion window when there is not enough available data to use the existing congestion window.


In some cases, the congestion window can be too large for the path and cause packet losses if it is later fully utilized.


When the application is not generating enough data, or any streams with data are stream flow control limited.



Fix Information

Correctly check for data limitations before increasing congestion window.

Behavior Change