control/controlclient/auto.go

@@ -302,6 +302,12 @@ func (c *Auto) restartMap() {
 	c.updateControl()
 }
 
+// RestartMap cancels the existing map poll and starts a fresh streaming one,
+// forcing the control server to send a new full netmap response.
+func (c *Auto) RestartMap() {
+	c.restartMap()
+}
+
 func (c *Auto) authRoutine() {
 	defer close(c.authDone)
 	bo := backoff.NewBackoff("authRoutine", c.logf, 30*time.Second)

ipn/ipnlocal/local.go

@@ -4980,9 +4980,16 @@ func (b *LocalBackend) SetExplicitServices(sl []tailcfg.Service) {
 	}
 	b.hostinfo.Services = sl
 	b.explicitServices = sl
+	ccAuto := b.ccAuto
 	b.mu.Unlock()
 
 	b.doSetHostinfoFilterServices()
+	// Restart the streaming map poll so the control server sends back a fresh
+	// netmap that includes our updated services in SelfNode, and so peers
+	// receive the update promptly via the control server's push.
+	if ccAuto != nil {
+		ccAuto.RestartMap()
+	}
 }
 
 // doSetHostinfoFilterServices calls SetHostinfo on the controlclient,