Thanks! I updated my Linux firewall rule, also below, and it works for me and my setup; but mine is a simple one with no Sonos, multi-room, etc. I didn’t have to enable that huge range of UDP ports, before or after Roon Server changed; maybe Red Hat’s firewalld doesn’t require it.
<?xml version="1.0" encoding="utf-8"?>
<service>
<short>Roon Server</short>
<description>Roon Server from Roon Labs plays music according to instructions from Roon Controllers</description>
<!-- per https://community.roonlabs.com/t/connection-failed-and-chromecast-issues-roon-using-new-additional-network-ports-since-880/181528/18 -->
<!-- unclear if necessary: port protocol="tcp" port="8008-8009"/ -->
<port protocol="udp" port="9003"/>
<port protocol="tcp" port="9330-9339"/>
<port protocol="tcp" port="30000-30010"/>
<!-- unclear if necessary: port protocol="udp" port="32768-65535"/ -->
<!-- igmp enables multicast. Unclear if broadcast and SSDP are needed too, see https://community.roonlabs.com/t/android-roon-remote-looses-connection-to-core-daily/61650/45 says is also required? -->
<protocol value="igmp"/>
</service>