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Editorial Team
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Asked: 2026-06-03T14:00:43+00:00

I’m attempting to run socket.io on Azure with a fallback to FlashSockets in IE9.

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I’m attempting to run socket.io on Azure with a fallback to FlashSockets in IE9. The app works using websockets in FF and Chrome, but when Socket.IO attempts to use the Flash fallback in IE9, I receive the following error.

[WebSocket] cannot connect to Web Socket server at > > ws://example.cloudapp.net:80/socket.io/1/flashsocket/19127550151689645722 (SecurityError)
make sure the server is running and Flash socket policy file is correctly placed

Socket.io is running on the server because I can access the the /socket.io/socket.io.js client file. IE9 also successfully grabs the SWF file that it should be requesting.

I’m assuming by the error message that the issue has to do with the port not being available. I haven’t been able to access the crossdomain.xml file using port :10843, which is Socket.io’s default port and where I think I would find it. This all also works locally in the Azure emulator. Any guidance on how to configure the port in Azure or how to find/test the crossdomain.xml file would be appreciated.

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1 Answer

  1. Editorial Team

    If the issue is just that port 10843 isn’t open, I think all you need to do is add <InputEndpoint protocol="tcp" port="10843" /> to your .csdef file.

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