Disable Portreserve (portreserve) The 'portreserve' service is a TCP port reservation utility that can be used to prevent portmap from binding to well known TCP ports that are required for other services. The 'portreserve' service can be disabled with the following command: '$ sudo systemctl disable portreserve'

The 'portreserve' service provides helpful functionality by preventing conflicting usage of ports in the reserved port range, but it can be disabled if not needed. Fix: # # Disable portreserve.service for all systemd targets # systemctl disable portreserve.service # # Stop portreserve.service if currently running # systemctl stop portreserve.service