This can be caused by the UPNP Multicast group used by Chromecast not being permitted by default.
Resolution
Enable multicast group 239.255.255.250 on the wireless controller from the Web GUI with the following process:
Click Controller > Network > Topologies
Click the Topology Chromecast is connected to
Click Multicast filters tab
Click Multicast Bridging check box
Click IP group Radio button and add 239.255.255.250/32
Click Save