Azure Front Door
An Azure service that provides a cloud content delivery network with threat protection.
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Error: Failed to start the transport 'WebSockets': Error: WebSocket failed to connect. The connection could not be found on the server, either the endpoint may not be a SignalR endpoint, the connection ID is not present on the server, or there is a proxy blocking WebSockets. If you have multiple servers check that sticky sessions are enabled.
Note: WebSockets setting is ON in App Service
Always ON is also enabled.