Last Modified: Jan 20, 2023
See more info
Known Affected Versions:
16.1.0, 16.1.1, 16.1.2, 22.214.171.124, 126.96.36.199, 16.1.3, 188.8.131.52, 184.108.40.206, 220.127.116.11
Opened: Mar 19, 2020
SYNs received with TSVal <= TS.Recent are dropped without sending an ACK in FIN-WAIT-2 state.
The new TCP connection cannot infer the half-open state of Local TCP connections, which prevents faster recovery of half-open connections. The local TCP connection stays around for a longer time.
-- Timestamps are enabled in TCP profile. -- Local TCP connection is in FIN-WAIT-2 state. -- Remote TCP connection abandoned the flow. -- A new TCP connection sends a SYN with TSVal <= TS.Recent to the local connection.
There are two workarounds: -- Reduce the Fin Wait 2 timeout (the default: 300 sec) so that TCP connection is terminated sooner. -- Disable TCP Timestamps.