Last Modified: Sep 23, 2022
Known Affected Versions:
15.1.0, 15.0.0, 14.1.0, 22.214.171.124, 126.96.36.199, 12.1.4, 188.8.131.52, 11.5.9
16.0.0, 15.1.4, 184.108.40.206, 220.127.116.11
Opened: Feb 28, 2019 Severity: 3-Major
The following benign message appears in the log: "cwnd too low." The message can be seen in both tmm logs (where it shows as 'notice' severity) and also in the ltm log (where it shows as 'crit' (critical) severity).
None. TCP resets the congestion window to 1 MSS.
The TCP congestion window has dropped below one Maximum Segment Size, which should not happen.
This message does not indicate a functional issue, so you can safely ignore this message. There is no action to take, but the presence of the message can be useful information for debugging other TCP problems.