diff --git a/src/crates/services/services-integrations/src/remote_connect/relay_client.rs b/src/crates/services/services-integrations/src/remote_connect/relay_client.rs
index 1a9b5ea723..624c44271c 100644
--- a/src/crates/services/services-integrations/src/remote_connect/relay_client.rs
+++ b/src/crates/services/services-integrations/src/remote_connect/relay_client.rs
@@ -648,6 +648,182 @@ mod tests {
         ));
     }
 
+    #[tokio::test]
+    async fn server_close_reconnects_and_restores_device_presence() {
+        use futures::{SinkExt, StreamExt};
+        use tokio::net::TcpListener;
+        use tokio_tungstenite::{accept_async, tungstenite::Message};
+
+        for websocket_close in [false, true] {
+            let listener = TcpListener::bind("127.0.0.1:0").await.unwrap();
+            let address = listener.local_addr().unwrap();
+            let (close_tx, mut close_rx) = mpsc::channel(1);
+            let (pending_tx, mut pending_rx) = mpsc::channel(1);
+            let server = tokio::spawn(async move {
+                for connection in 0..2 {
+                    let (stream, _) = listener.accept().await.unwrap();
+                    let mut socket = accept_async(stream).await.unwrap();
+                    socket
+                        .send(Message::Text(
+                            format!(
+                                "0{}",
+                                json!({"sid":"test", "upgrades":[], "pingInterval":25_000,
+                                    "pingTimeout":5_000, "maxPayload":1_000_000})
+                            )
+                            .into(),
+                        ))
+                        .await
+                        .unwrap();
+                    let auth = socket.next().await.unwrap().unwrap().into_text().unwrap();
+                    let auth: serde_json::Value =
+                        serde_json::from_str(auth.strip_prefix("40").unwrap()).unwrap();
+                    assert_eq!(auth["token"], "test-token");
+                    assert_eq!(auth["clientType"], "machine-scoped");
+                    socket
+                        .send(Message::Text("40{\"sid\":\"test\"}".into()))
+                        .await
+                        .unwrap();
+                    socket
+                        .send(Message::Text(
+                            format!(
+                                "42{}",
+                                json!(["auth-ok", {"userId":"account", "deviceId":"host"}])
+                            )
+                            .into(),
+                        ))
+                        .await
+                        .unwrap();
+
+                    // Each replacement socket must register the host again.
+                    let registration = socket.next().await.unwrap().unwrap().into_text().unwrap();
+                    let registration = registration.strip_prefix("42").unwrap();
+                    let event_start = registration.find('[').unwrap();
+                    let event: serde_json::Value =
+                        serde_json::from_str(&registration[event_start..]).unwrap();
+                    assert_eq!(event, json!(["rpc-register", {"method":"host:invoke"}]));
+                    socket
+                        .send(Message::Text(
+                            format!("43{}[{{\"ok\":true}}]", &registration[..event_start]).into(),
+                        ))
+                        .await
+                        .unwrap();
+                    let mut devices = vec![json!({"device_id":"host", "device_name":"Host"})];
+                    if connection == 1 {
+                        devices.push(json!({"device_id":"peer", "device_name":"Peer"}));
+                    }
+                    socket
+                        .send(Message::Text(
+                            format!(
+                                "42{}",
+                                json!(["ephemeral", {"type":"device-presence", "devices":devices}])
+                            )
+                            .into(),
+                        ))
+                        .await
+                        .unwrap();
+
+                    for call in 0..if connection == 0 { 2 } else { 1 } {
+                        let request = socket.next().await.unwrap().unwrap().into_text().unwrap();
+                        let request = request.strip_prefix("42").unwrap();
+                        let event_start = request.find('[').unwrap();
+                        let event: serde_json::Value =
+                            serde_json::from_str(&request[event_start..]).unwrap();
+                        assert_eq!(event[0], "rpc-call");
+                        assert_eq!(event[1]["method"], "peer:invoke");
+                        assert_eq!(
+                            event[1]["params"]["encrypted_data"],
+                            if call == 0 { "request" } else { "pending" }
+                        );
+                        if call == 0 {
+                            socket
+                                .send(Message::Text(
+                                    format!(
+                                        "43{}{}",
+                                        &request[..event_start],
+                                        json!([{"ok":true, "result":{
+                                            "encrypted_data":format!("reply-{connection}"), "nonce":"nonce"
+                                        }}])
+                                    )
+                                    .into(),
+                                ))
+                                .await
+                                .unwrap();
+                        } else {
+                            // This request reached the old socket; it must
+                            // fail on close and never replay on its replacement.
+                            pending_tx.send(()).await.unwrap();
+                        }
+                    }
+
+                    close_rx.recv().await.unwrap();
+                    if connection == 0 {
+                        if websocket_close {
+                            socket.close(None).await.unwrap();
+                        } else {
+                            socket.send(Message::Text("1".into())).await.unwrap();
+                        }
+                        while let Some(Ok(message)) = socket.next().await {
+                            if message.is_close() {
+                                break;
+                            }
+                        }
+                    }
+                }
+            });
+
+            let (client, mut events) = RelayClient::new();
+            let result = tokio::time::timeout(Duration::from_secs(8), async {
+                client.connect(&format!("http://{address}")).await.unwrap();
+                client
+                    .connect_authenticated("test-token", "Host")
+                    .await
+                    .unwrap();
+                assert!(matches!(events.recv().await, Some(RelayEvent::Connected)));
+                assert!(matches!(events.recv().await, Some(RelayEvent::AuthOk { .. })));
+                assert!(matches!(
+                    events.recv().await,
+                    Some(RelayEvent::DevicePresence { devices }) if devices.len() == 1
+                ));
+                assert_eq!(
+                    client.request_device("peer", "request", "nonce").await.unwrap(),
+                    ("reply-0".into(), "nonce".into())
+                );
+
+                let (pending, ()) = tokio::join!(
+                    client.request_device("peer", "pending", "nonce"),
+                    async {
+                        pending_rx.recv().await.unwrap();
+                        close_tx.send(()).await.unwrap();
+                        assert!(matches!(events.recv().await, Some(RelayEvent::Disconnected)));
+                    }
+                );
+                assert!(pending.is_err(), "an unacknowledged request must not report success");
+                assert!(matches!(events.recv().await, Some(RelayEvent::Reconnected)));
+                assert!(matches!(events.recv().await, Some(RelayEvent::AuthOk { .. })));
+                assert!(matches!(
+                    events.recv().await,
+                    Some(RelayEvent::DevicePresence { devices })
+                        if devices.iter().map(|device| device.device_id.as_str()).collect::<Vec<_>>()
+                            == ["host", "peer"]
+                ));
+                assert_eq!(client.connection_state().await, ConnectionState::Connected);
+                assert_eq!(
+                    client.request_device("peer", "request", "nonce").await.unwrap(),
+                    ("reply-1".into(), "nonce".into())
+                );
+                close_tx.send(()).await.unwrap();
+            })
+            .await;
+            client.disconnect().await;
+            if result.is_err() {
+                server.abort();
+            }
+            let server_result = server.await;
+            result.expect("closed Relay transport must reconnect and refresh device presence");
+            server_result.unwrap();
+        }
+    }
+
     #[test]
     fn reply_deadline_respects_forwarded_timeout() {
         let now = Instant::now();
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new file mode 100644
index 0000000000..3827ca7f07
--- /dev/null
+++ b/third_party/eioc/Cargo.lock
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diff --git a/third_party/eioc/OPENBITFUN-PATCH.md b/third_party/eioc/OPENBITFUN-PATCH.md
index 655ee19ef5..cc53d12414 100644
--- a/third_party/eioc/OPENBITFUN-PATCH.md
+++ b/third_party/eioc/OPENBITFUN-PATCH.md
@@ -1,11 +1,28 @@
-# Engine.IO TLS provider selection
+# Engine.IO integration patches
 
 Source: crates.io `eioc` 0.5.0, from <https://github.com/Stanley5249/sioc-rs>.
 This copy retains the upstream MIT / Apache-2.0 license choice.
 
-The sole source change is in Cargo.toml: `rustls-tls` enables
+In Cargo.toml, `rustls-tls` enables
 `reqwest/rustls-no-provider` instead of `reqwest/rustls`.
 OpenBitFun selects ring through its existing TLS provider owner. Upstream's
 Reqwest feature otherwise forces AWS-LC alongside ring, even when the Socket.IO
-client receives OpenBitFun's configured HTTP client. Engine.IO wire behavior is
-unchanged. Remove this patch when upstream exposes provider-neutral Rustls.
+client receives OpenBitFun's configured HTTP client. Remove this TLS patch when
+provider-neutral Rustls is available.
+
+Connection closure is also forwarded through both protocol layers. WebSocket
+Close frames become Engine.IO Close packets, and the engine sends
+`Message::Close` to the Socket.IO manager before exiting. Previously a normal
+server close could leave namespace receivers waiting forever, preventing the
+account connection owner from reconnecting and publishing device presence.
+The engine closes its inbound queue before notifying the manager so pending
+outbound writes cannot deadlock the close notification under backpressure.
+If the manager has already exited, the failed notification is logged at debug
+level and the server close still completes normally.
+Wire formats and the existing reconnect policy are unchanged.
+
+The focused product regression command is:
+
+```bash
+cargo test --locked -p openbitfun-services-integrations --no-default-features --features remote-connect --lib remote_connect::relay_client::tests::server_close_reconnects_and_restores_device_presence
+```
diff --git a/third_party/eioc/src/engine.rs b/third_party/eioc/src/engine.rs
index d0f8bc7499..9b413f2f1a 100644
--- a/third_party/eioc/src/engine.rs
+++ b/third_party/eioc/src/engine.rs
@@ -160,6 +160,17 @@ where
                         Packet::Close => {
                             tracing::debug!("server closed");
 
+                            // Release a manager blocked on outbound capacity
+                            // before waiting for space in its inbound queue.
+                            engine_rx.close();
+                            // The Socket.IO manager still owns live namespace
+                            // senders. Notify it before this task exits so its
+                            // receivers close and the account owner can reconnect.
+                            // A manager that already exited has nothing left to
+                            // release, so a failed notification is not an error.
+                            if let Err(error) = sink.send(Message::Close).await {
+                                tracing::debug!(%error, "manager already closed");
+                            }
                             break;
                         }
                         Packet::Ping(payload) => {
@@ -365,15 +376,75 @@ mod tests {
     }
 
     #[tokio::test]
-    async fn engine_io_server_close_exits_ok() {
+    async fn engine_io_server_close_notifies_sink_and_exits_ok() {
         let s = setup();
         s.tx.send(EngineAction::Transport(Frame::Packet(Packet::Close)))
             .await
             .unwrap();
-        let (result, _) = s.run().await;
+        let (sink, messages) = capturing_sink();
+        let (result, _) = s.run_with(sink).await;
+        result.unwrap();
+        assert!(matches!(
+            messages.lock().unwrap().as_slice(),
+            [Message::Close]
+        ));
+    }
+
+    #[tokio::test]
+    async fn engine_io_server_close_tolerates_closed_manager() {
+        let s = setup();
+        s.tx.send(EngineAction::Transport(Frame::Packet(Packet::Close)))
+            .await
+            .unwrap();
+        let (result, _) = s.run_with(FailingSink).await;
         result.unwrap();
     }
 
+    #[tokio::test]
+    async fn engine_io_server_close_releases_blocked_senders() {
+        let (engine_tx, engine_rx) = mpsc::channel(1);
+        engine_tx
+            .send(EngineAction::Transport(Frame::Packet(Packet::Close)))
+            .await
+            .unwrap();
+        let (manager_tx, manager_rx) = mpsc::channel(1);
+        manager_tx
+            .send(Message::Text("queued directive".into()))
+            .await
+            .unwrap();
+        let (transport_tx, _transport_rx) = mpsc::channel(1);
+        let (handshake_tx, handshake_rx) = oneshot::channel();
+        handshake_tx.send(make_handshake()).unwrap();
+
+        // A manager processing outbound messages cannot drain its inbox until
+        // the engine accepts the writes or reports that the session is closed.
+        let manager = async move {
+            if engine_tx
+                .send(EngineAction::Sink(Message::Text("first write".into())))
+                .await
+                .is_ok()
+            {
+                engine_tx
+                    .send(EngineAction::Sink(Message::Text("pending write".into())))
+                    .await
+                    .unwrap_err();
+            }
+            drop(manager_rx);
+        };
+        let engine = engine_io(
+            tokio_util::sync::PollSender::new(manager_tx),
+            engine_rx,
+            transport_tx,
+            handshake_rx,
+            CancellationToken::new(),
+        );
+        let _ = tokio::time::timeout(std::time::Duration::from_secs(1), async {
+            tokio::join!(engine, manager)
+        })
+        .await
+        .expect("server close must release pending writes even when the manager inbox is full");
+    }
+
     #[tokio::test]
     async fn engine_io_engine_channel_closed_exits_ok() {
         let s = setup();
diff --git a/third_party/eioc/src/websocket.rs b/third_party/eioc/src/websocket.rs
index b3bd5ab43d..9f7cac0b69 100644
--- a/third_party/eioc/src/websocket.rs
+++ b/third_party/eioc/src/websocket.rs
@@ -78,6 +78,7 @@ impl Stream for WebSocketStream {
 
                             Some(Ok(Frame::Binary(binary)))
                         }
+                        WebSocketMessage::Close(_) => Some(Ok(Frame::Packet(Packet::Close))),
                         _ => continue,
                     },
                     Err(e) => Some(Err(e.into())),
@@ -515,6 +516,10 @@ mod tests {
         assert!(
             matches!(action, crate::engine::EngineAction::Transport(Frame::Packet(Packet::Message(m))) if m == "data")
         );
+        assert!(matches!(
+            engine_rx.recv().await.unwrap(),
+            crate::engine::EngineAction::Transport(Frame::Packet(Packet::Close))
+        ));
         server_task.await.unwrap();
     }