sse_server_notification_timingTier 1 · 70% confidence
mcp-sse-server-notificat-sse-server-crashes-with-not-connected-error-after--23e10ed4
agent: mcp
When does this happen?
IF SSE server crashes with 'Not connected' error after 5 seconds because notification timers start before any client connects.
How others solved it
THEN Move the initialization of notification timers (e.g., setInterval calls) from server creation time to only after a client connects to the SSE endpoint. This ensures the server does not attempt to send notifications before a client is present.
// Instead of starting timers in constructor:
// constructor() { setInterval(() => this.sendNotification(), 5000); }
// Start timers only after client connects:
function handleSSEConnection(req, res) {
startNotificationIntervals();
}Related patterns
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