TCP TIME_WAIT sockets remain for over 60 seconds
Issue
- TCP
TIME_WAIT
sockets remain for over 60 seconds - High CPU load results in TW reuse failure
- RHEL is slow to clean out timewait state from old connections
- Packet capture shows Challenge ACK sent to connection reuse after 1 minute instead of new SYN being accepted, why does RHEL send Challenge ACK?
Environment
- Red Hat Enterprise Linux 7
- TCP (Transmission Control Protocol) network connections in
TIME_WAIT
state - RHEL listening on TCP port where it is also the Active Closer (sends
FIN
first) - Reuse of the same IP and port tuple
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