Be sure any firewall proxy, load balancer, or cache server supports websockets. This can be an issue on the client or server side.
Websocket is connected or disconnected without error Blazor Web App .Net 8

Hello,
Websocket not connected in production returns the error
WebSocket connection to 'wss://accounts.innovustech.in/_blazor?id=7pvrUUJdL7CjvoTLn17Y4A' failed:
(anonymous) @ blazor.web.js:1
blazor.web.js:1 [2025-07-27T11:40:20.323Z] Information: (WebSockets transport) There was an error with the transport.
blazor.web.js:1 [2025-07-27T11:40:20.323Z] 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.
log @ blazor.web.js:1
blazor.web.js:1 [2025-07-27T11:40:20.496Z] Warning: Failed to connect via WebSockets, using the Long Polling fallback transport. This may be due to a VPN or proxy blocking the connection. To troubleshoot this, visit https://aka.ms/blazor-server-using-fallback-long-polling.
log @ blazor.web.js:1
blazor.web.js:1 [2025-07-27T11:40:20.760Z] Error: There was an unhandled exception on the current circuit, so this circuit will be terminated. For more details turn on detailed exceptions by setting 'DetailedErrors: true' in 'appSettings.Development.json' or set 'CircuitOptions.DetailedErrors'.
log @ blazor.web.js:1
blazor.web.js:1 [2025-07-27T11:40:20.809Z] Information: Connection disconnected.
/_blazor?id=gKD-9FEuzfl-Wc0p3ts6rQ:1 Failed to load resource: the server responded with a status of 404 ()
blazor.web.js:1 [2025-07-27T11:40:20.822Z] Warning: Failed to deliver completion notification for render '2'.
On prod Windows Hosting,
I have enabled WebSocket. also web.config files has webSocket enabled is "true"
the hosting model is inprocess
Developer technologies | .NET | Blazor
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Bruce (SqlWork.com) 79,101 Reputation points Volunteer Moderator
2025-07-27T16:07:17.58+00:00