Many modern smart devices and streaming services — like Spotify Connect, AirPlay 2, Tidal Connect, Chromecast, and others — rely on your home network allowing certain ports and protocols to function correctly.
If you're experiencing issues with device discovery, streaming interruptions, or network connectivity, it may be due to router settings blocking essential ports or multicast traffic.
This guide outlines the key ports you should ensure are open, and important features like multicasting and IGMP Proxy that need to be enabled.
Home routers often include firewalls and port filtering features that block unknown or unused ports to protect you from online threats. While this is great for security, it can also block legitimate services like:
Chromecast & AirPlay 2
Spotify Connect / Tidal Connect / Qobuz
UPnP/DLNA streaming
Smart home devices using Bonjour, SSDP, or Control4
Look for a setting such as:
"Enable Multicast"
"IGMP Snooping"
"IGMP Proxy" (must be enabled for Chromecast and DLNA to function)
This allows devices to discover each other and communicate over your LAN.
Below is a list of ports you may need to allow through your firewall or ensure are not being blocked:
| Port | Purpose |
|---|---|
| 5353 | mDNS for Bonjour / Avahi / Apple devices (local discovery) |
| 1900 | SSDP / UPnP discovery |
| 1800 | LUCI commands and some smart devices |
| 123 | NTP – Network Time Protocol (for accurate time sync) |
| 32768–61000 | Chromecast device discovery |
| Port Range | Purpose |
|---|---|
| 80, 8008 | HTTP / Chromecast HTTP |
| 443, 8443 | HTTPS / Secure control and media connections |
| 9095–9099 | Spotify Connect zero config ports |
| 8000 | Qobuz Connect |
| 9090 | Tidal Connect |
| 49494 | UPnP DMR (Digital Media Renderer) |
| 3689 | AirPlay / iTunes DAAP |
Some devices require multicast traffic to the following IP address:
📍 239.255.255.250
Used for:
UPnP/DLNA M-Search
Chromecast discovery
Control4 Smart Home Automation
Enable IGMP Proxy in advanced router settings.
Check if your router has a “Smart Connect” or “Guest Network” setting that blocks multicast — if so, disable it or enable multicast on that network.
Some routers list these services as preconfigured “Applications” or “Rules” — look for options like DLNA, AirPlay, or UPnP in your firewall or traffic rules tab.
Try:
Restarting your router after saving changes
Making sure all devices are on the same network and frequency (e.g. not split between 2.4GHz and 5GHz guest networks)
Turning off client isolation if it’s enabled
If you're unsure how to access your router’s admin interface or configure ports, contact your router manufacturer or ISP, or consult the product manual for model-specific instructions.