The error message implies that you've configured HTCondor on those
hosts to bind to a random port ('0') rather than the default HTCondor port
(or any specific port), which should generally work but seems a little
weird for the system HTCondor.
Otherwise, I don't know what this error message might mean; it
appears to be claiming that you've run out loopback-interface source
ports, which seems unlikely. Do you have any port-range restrictions set?