Hello, the reason your SSE stream disconnects automatically after about 10 minutes is that the default timeout for the ingress controller on the dedicated server is 600 seconds (10 minutes). Connections exceeding this time are actively closed by the gateway; this is not an issue with your service itself.
This timeout on the dedicated server can be adjusted, for example, to 24 hours or longer. Once configured, your SSE long-lived connection will no longer be disconnected.
Please let us know the timeout duration you would like to set, and we can assist you with the configuration.