A first step may be to determine the process or application. I'd start with the roles installed on server and also from cmd.exe run a netstat -aon then match up the PID to the process in Task Manager\Processes tab.
Which KB can fix the port exhaustion for windows server 2019. Event id 4231
Anonymous
I cannot find which KB can fix the port exhaustion for OS 2019. It showed the event ID 4231.
Windows for business | Windows Server | User experience | Other
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