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Those warnings are innocuous, but warnings nonetheless:
(rhythmbox:24164): libdmapsharing-WARNING **: Unable to start music sharing server on port 3689: Could not listen on address 0.0.0.0, port 3689: Error binding to address: Address already in use. Trying any open IPv6 port

See:
edbeeba31ff150cd8ec048dd8149bbcf7f5bcefd upstream commit
and:
https://bugzilla.gnome.org/show_bug.cgi?id=766723

Warnings are gone and services/TCP ports

0.0.0.0:33217
0.0.0.0:3689
:::3689
:::33217

get opened.

I guess it is ok.

libdmapsharing-2.9.39-1.el7 in comment 3 was released in RHEL 7.4:
https://access.redhat.com/errata/RHBA-2017:2315