OpenWRT voids its warranty...

The new firmware is what causes this to break, I updated mine this morning and then all of a sudden my chromecast stopped working, I checked the release notes and I believe this to be the cause

"(3) Improved the security mechanism, enhanced the ability to prevent the XSS and DoS attack. "

I think they fixed this by disabling Multicast and other features required by Chromecast...downgrading now and will report back

I upgraded my AP this morning and then began experiencing chromecast issues and stumbled upon this thread, after doing some digging I believe the problem lies within the updated firmware |

'(3) Improved the security mechanism, enhanced the ability to prevent the XSS and DoS attack. "

I believe this function disables Multicast transmissions as well as other features required by chromecast. I am downgrading my firmware now and will report back.

Yep, the updated firmware was the issue, just downgrade the previous one and it will work right away.

Hi guys
I found an intersting phenomenon.
After I have set the chromecast with the error message,
but I can use the YouTube to cast video on my TV.
I think there may be some information lost through the 901.
Whatever , I can enjoy my TV.

Thanks. That's very interesting as I had tried downgrading and still had the issue. I've raised a ticket with TP-Link and they've acknowledged they can recreate the issue (I think on both FWs). Does it work for you consistently? What are you using - Android or iPhone?

Yeah, it worked consistently both wiht my Youtube APP and the Chrome .
I used an iphone 5s, and the video can be casted stably.

I did have the same problem and couldn't solve it in any other way than downgrading firmware to 3.14.8 Build 130828 Rel.63678n.

Spent hours trying to get my Chromecast to work... blamed it on my firewall, but turned out it was the TL-WA901ND, which I use in Access Point mode. As others have said, the fix was to DOWNGRADE to firmware 3.14.8 Build 130828 Rel.63678n.

Thank you very much for posting this solution!

- Scott