ChromeCast and Sonicwall TZ 210 wireless-N

I trying out a Chromecast device; I can connect it to the same WiFi as my Android phone without trouble. However I get the following message:-

Chromecase message
I have followed the link and it really hasn't helped me. I'm using a Sonicwall TZ 210 wireless-N and the two devices are connecting on a guest network. I'm unsure what changes I need to make on the Sonicwall to allow the devices to communicate. Can anyone help?
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cescentmanAsked:
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Craig BeckCommented:
Is the Sonicwall blocking inter-client communication?
cescentmanAuthor Commented:
How can I tell?
Craig BeckCommented:
Do you have a firewall rule which allows access from WLAN to WLAN?
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cescentmanAuthor Commented:
No.
Craig BeckCommented:
So you're not allowing clients to talk to each other across the WLAN.  You should add a rule which allows WLAN to WLAN communication and see if that helps.

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cescentmanAuthor Commented:
Bingo
cescentmanAuthor Commented:
Thanks
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