Since restart of the service restarted the listener, there was no second process listening on the same port. This is not a part of HA and does not work with ASM so there is no CRS and no auto restart of processes that seems to die.
Just run of the mill stand alone oracle server. Nothing in the alert log at the times the listener died. Adar Yechiel Rechovot, Israel Niall Litchfield wrote:
I've not seen that on windows, but several times on linux. A new listener process was being created and so two processes were listening on the same port. process explorer should show if this is happening on windows. netstat will tell you if something else has the port.
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