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My understanding is that COMET implementations of WebSync and SignalR do not directly use IIS and are a few layers lower on the ISO model.

After reading Qualys's blog regarding slow TCP reading, I was wondering if this had any affect on COMET implementations since some are already using "long polling", websockets, or perhaps some other technique.

  • Are COMET (or reverse AJAX) installations not vulnerable to this class of attack by design?
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WebSync runs directly on top of the IIS/.NET stack, and so it relies on the Windows/IIS kernel to process TCP/HTTP for both long-polling and WebSocket transports. I believe SignalR does this as well.

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