SOLVED: Connection refused on NAS after upgrading to 10.9.xx from 10.8.13

[AGiLiT]

Fixed it!  Thank you Google.  Googling 'Failed to create coreclr in docker container' led me to discussions about upgrades in .Net and docker versions.  WD doesn't support docker natively, so we have to rely on the community to provide .bin files to install it.  There aren't any really current versions that I could find.  However, one of the posters in one of the threads I looked at provided this solution:

add argument --security-opt seccomp=unconfined for docker run command.

That fixed it for me, and Jellyfin is now up and running on my NAS.

Thanks again for the help.