The address the TCP packets from the scheduler seem to come from do not match the scheduler’s sched_host attribute (cfr. qmgr -c “print sched @default” output.) The server logs will tell you where the server thinks the packets are coming from (I.e. what to set sched_host to).
One possible way to solve it if you can’t figure it out is to set sched_host to localhost and to add PBS_SERVER_HOST_NAME=localhost to the line on which you start pbs_sched (that will make the scheduler contact 127.0.0.1, which will also make the source IP address for the packets match that address.