I have built Slurm 23.11.7 on two machines. Both are running Ubuntu 22.04.
While Slurm runs fine on one machine, on the 2nd machine it does not. First
machine is both a controller and a node while the 2nd machine is just a
node. On both machines, I built the Slurm debian package as per the Slurm
docs instructions. Slurmd logs show this:

 error: unpack_header: protocol_version 9472 not supported
 error: unpacking header
 error: destroy_forward: no init
 error: slurm_receive_msg_and_forward: [[host-4.attlocal.net]:38960]
failed: Message receive failure
 error: service_connection: slurm_receive_msg: Message receive failure
 debug:  _service_connection: incomplete message
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