Compressor 4.1 shared cluster computer not appearing - but slave can see master

Question

On my main "master" machine, I cannot see one of my shared cluster machines. However, on the particular shared cluster machine (slave) that my "master" cannot see, the slave can see the master in the list of shared computers. So, in other words, I suppose I could launch the Compressor job from the "slave" machine [since the source file is on a network drive that all machines can access], but it doesn't make any sense.
Why can't the "master" see the "slave".
I've tried restarting the master computer, tried turning off wifi and ethernet on the master computer, tried manually inputting the IP address and host name on the master computer in the list of shared computers by hitting the "plus" button. Also tried setting the "Use network interfaces" option to either both, ethernet only, or wi-fi only, also tried resetting the compressor queue, and trashing the Compressor preferences.
Nothing works. What's strange is that this master computer was able to see the slave computer two weeks ago, using Compressor 4.1. Nothing has changed. They are both on the same 10.0.0.x network and subnet. The master machine can ping the slave machine.
Any ideas?

Answer 1

Just posted this in this discussion forum. Might be helpful even though its specifically for Compressor V4.0.
Run through some of the the procedure if you are on Compressor V4.0 earlier.
https://discussions.apple.com/thread/5781288?tstart=0
As you're using Compressor V4.1, check the cluster and compressor logs for errors and network and file system permission errors:
~/Library/Logs/Compressor (new in V4.1) to see what he jobcontroller and services node are doing
check /var/logs (system log)
else for compressor V4.1 it seem sensitive to hardware configurations now.
might be of some help.
w