fuser the zombie PID
May 07 16:38:49 camelot stunnel[1637537]: LOG5[ui]: Binding service [legacyservice] to :::8443: Address already in use (98)
fuser 8443/tcp
kill -9 1637539 Killing the zombie PID fixes the stuck lock
the big picture
Switches and VLANS
Or why switch config is the most important step
1. Switches are the foundation of network communication
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Every device on a local network (PCs, printers, servers, etc.) typically connects through a switch.