squeezebox doesn't connect to slimserver

I'm running slimserver on archlinux box but cannot seem to reliably connect my squeezebox radios to the server.

Server:
Logitech Media Server Version: 7.9.0 - TRUNK @ UNKNOWN
Hostname: server.ourhome.net
Server IP Address: 10.20.30.1
Server HTTP Port Number: 9000
Operating system: Linux - EN - utf8
Platform Architecture: x86_64-linux
Perl Version: 5.22.0 - x86_64-linux-thread-multi

Radio:
Version 7.7.3 r16676

Firewall:
# Allow multicast
-A INPUT -i lan -s 10.20.30.0/24 -d 239.0.0.0/255.0.0.0 -j ACCEPT
# Allow SlimServer
-A INPUT -s 10.20.30.0/24 -p udp -m multiport --dports 3483,17784 -m conntrack --ctstate NEW -j ACCEPT
-A INPUT -s 10.20.30.0/24 -p tcp -m multiport --dports 3483,9000,9090 -m conntrack --ctstate NEW -j ACCEPT
-A FORWARD -i lan -s 10.20.30.0/24 -p tcp -m multiport --dports 3483,9000 -m conntrack --ctstate NEW -j ACCEPT
-A OUTPUT -p udp -m multiport --dports 3483,17784 -m conntrack --ctstate NEW -j ACCEPT
-A OUTPUT -p tcp -m multiport --dports 3483,9000,9090 -m conntrack --ctstate NEW -j ACCEPT

I can ssh into the radios and ping the server on ports 3483 & 9000
Looking at journalctl logs for the iptables activity seems to only show multicast traffic being dropped.

Sep 13 14:42:36 server.ourhome.net kernel: INPUT DROP IN=lan OUT= MAC=ff:ff:ff:ff:ff:ff:00:04:20:2d:65:ff:08:00 SRC=10.20.30.20 DST=255.255.255.255 LEN=55 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=UDP SPT=17784 DPT=17784 LEN=35
Sep 13 14:42:36 server.ourhome.net kernel: INPUT DROP IN=lan OUT= MAC=ff:ff:ff:ff:ff:ff:00:04:20:2d:65:ff:08:00 SRC=10.20.30.20 DST=255.255.255.255 LEN=65 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=UDP SPT=37939 DPT=3483 LEN=45
Sep 13 14:42:46 server.ourhome.net kernel: INPUT DROP IN=lan OUT= MAC=00:15:17:d2:2d:d8:00:04:20:2d:65:ff:08:00 SRC=10.20.30.20 DST=10.20.30.1 LEN=322 TOS=0x00 PREC=0x00 TTL=64 ID=19238 DF PROTO=UDP SPT=68 DPT=67 LEN=302
Sep 13 14:43:36 server.ourhome.net kernel: INPUT DROP IN=lan OUT= MAC=ff:ff:ff:ff:ff:ff:00:04:20:2d:65:ff:08:00 SRC=10.20.30.20 DST=255.255.255.255 LEN=55 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=UDP SPT=17784 DPT=17784 LEN=35
Sep 13 14:43:36 server.ourhome.net kernel: INPUT DROP IN=lan OUT= MAC=ff:ff:ff:ff:ff:ff:00:04:20:2d:65:ff:08:00 SRC=10.20.30.20 DST=255.255.255.255 LEN=65 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=UDP SPT=37939 DPT=3483 LEN=45
Sep 13 14:44:36 server.ourhome.net kernel: INPUT DROP IN=lan OUT= MAC=ff:ff:ff:ff:ff:ff:00:04:20:2d:65:ff:08:00 SRC=10.20.30.20 DST=255.255.255.255 LEN=55 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=UDP SPT=17784 DPT=17784 LEN=35
Sep 13 14:44:36 server.ourhome.net kernel: INPUT DROP IN=lan OUT= MAC=ff:ff:ff:ff:ff:ff:00:04:20:2d:65:ff:08:00 SRC=10.20.30.20 DST=255.255.255.255 LEN=65 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=UDP SPT=37939 DPT=3483 LEN=45

I'm about to go crazy with this. Does the connection setup depend upon UPNP and if so what else do I need. Is there a utility or file on the radio that I can change to set the connection parameters?