Can't log at this point, there are 6500 TCP sessions in a close wait status.
Many close_wait TCP sessions
Excessive close_wait TCP sessions
Release : 21.2
Component : Performance Management Portal Web UI
APM is causing this issue.
Update /opt/CA/PerformanceCenter/wily/core/config/capm-toggles.pbd, and append to end:
TurnOff: SocketTracing