KB01467 - Control4 ShairBridge (Airplay) not working when UHD-PRO3 is connected to network

Subject: Losing Control 4 Airplay (ShairBridge) When Connecting UHD-PRO3 matrix

SKUs: Any product/manufacturer that use mDNS data for equipment discovery

Symptom: When connecting a networked device with mDNS functionality i.e: AT-UHD-PRO3-88M matrix into the network, you lose Control 4 Airplay (ShairBridge) connectivity. Control 4 Airplay will still broadcast, but you will be unable to connect while the mDNS source is is connected to the network. 

Troubleshooting: Disconnect the mDNS source i.e: AT-UHD-PRO3-88M from the network. Verify Control 4 Airplay (ShairBridge) is re-established.

Solution: The issue lies within Control 4 and how the ShairBridge feature reacts to mDNS traffic, and some other known multicast traffic you may find in today’s network environment.

You can do the following to allow functionality of your Atlona matrix:

1. Change the control method from IP to RS232, and disconnect the video matrix LAN interface from the network
2. Enable SSH mode on AT-UHD-PRO3-88M and control the video matrix via RS232
   1. This will allow the network cable to still be connected for remote management / service if needed
      1. WebGUI access and Telnet are not supported in SSH mode.
      2. RS232 will function regardless the SSH mode. To enable webGUI you can turn off SSH with following command using RS232 or SSH “syslock off”
   2. Set up a separate VLAN for Control4 or mDNS source i.e: AT-UHD-PRO3-88M video matrix
      1. Please refer to a network administrator to assist with this
   3. Add an Access List, AKA “ACL” – (only if your current network equipment supports it)
      1. You would need a router or a managed switch that supports Access List, you should only allow outbound traffic TCP 80, 23, and ICMP.

If these solutions do not work for application, please contact Control 4 technical support to see if a patch can/has been released.

Article ID: KB01467