IPTV not working on any other network than default

[abrondijk]

I cannot manage to get IPTV working on any other network than the default.
If I plug a setupbox into a port that has the native VLAN set to the IPTV specific network I created, the stream stops and gives me an error 303. If I restart the box, it gets stuck on 85%.

Diagnostic output:

=== Configuration ===
WAN Interface: eth8
WAN VLAN: 4 (dev iptv)
WAN DHCP: true (options "-O staticroutes -V IPTV_RG")
WAN Ranges: 213.75.0.0/16  217.166.0.0/16  195.121.0.0/16
LAN Interfaces: br0  br50
IGMP Proxy quickleave disabled: false
IGMP Proxy debug: true
=== IP Link and Route ===
46: iptv@eth8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    inet 10.172.237.234/20 brd 10.172.239.255 scope global iptv
       valid_lft forever preferred_lft forever
10.172.224.0/20 proto kernel scope link src 10.172.237.234
213.75.112.0/21 via 10.172.224.1 metric 246
=== Service Logs ===
May 29 16:59:48 UDMPro udm-iptvd[291778]: RECV V2 member report   from 10.0.50.1       to 224.0.0.251
May 29 16:59:48 UDMPro udm-iptvd[291778]: The IGMP message was from myself. Ignoring.
May 29 16:59:48 UDMPro udm-iptvd[291778]: RECV V2 member report   from 10.0.50.1       to 233.89.188.1
May 29 16:59:48 UDMPro udm-iptvd[291778]: The IGMP message was from myself. Ignoring.
May 29 16:59:48 UDMPro udm-iptvd[291778]: RECV V2 member report   from 10.0.10.244     to 228.250.250.250
May 29 16:59:48 UDMPro udm-iptvd[291778]: Updated route entry for 228.250.250.250 on VIF #0
May 29 16:59:48 UDMPro udm-iptvd[291778]: RECV V2 member report   from 10.0.50.1       to 224.0.0.22
May 29 16:59:48 UDMPro udm-iptvd[291778]: The IGMP message was from myself. Ignoring.
May 29 16:59:48 UDMPro udm-iptvd[291778]: RECV V2 member report   from 10.0.10.244     to 239.255.90.90
May 29 16:59:48 UDMPro udm-iptvd[291778]: Updated route entry for 239.255.90.90 on VIF #0

I tried with both igmpproxy and improxy.

Network settings:

Does anyone have an idea of why this might be?

[erikpost]

Why do you have two LAN interfaces configured for the udm-iptv script? You should only add the LAN interface for the local VLAN that you use for IPTV.

Also try changing the IPTV_WAN_RANGES setting in /etc/udm-iptv.conf to the value "0.0.0.0/0" and then restarting the udm-iptv script with systemctl restart udm-iptv.