diff --git a/easytier/src/connector/udp_hole_punch/common.rs b/easytier/src/connector/udp_hole_punch/common.rs
index ce94ba7..e89808d 100644
--- a/easytier/src/connector/udp_hole_punch/common.rs
+++ b/easytier/src/connector/udp_hole_punch/common.rs
@@ -56,8 +56,8 @@ impl From<NatType> for UdpNatType {
     fn from(nat_type: NatType) -> Self {
         match nat_type {
             NatType::Unknown => UdpNatType::Unknown,
-            NatType::NoPat | NatType::OpenInternet => UdpNatType::Open(nat_type),
-            NatType::FullCone | NatType::Restricted | NatType::PortRestricted => {
+            NatType::OpenInternet => UdpNatType::Open(nat_type),
+            NatType::NoPat | NatType::FullCone | NatType::Restricted | NatType::PortRestricted => {
                 UdpNatType::Cone(nat_type)
             }
             NatType::Symmetric | NatType::SymUdpFirewall => UdpNatType::HardSymmetric(nat_type),
diff --git a/easytier/src/easytier-core.rs b/easytier/src/easytier-core.rs
index 823a718..fa058e4 100644
--- a/easytier/src/easytier-core.rs
+++ b/easytier/src/easytier-core.rs
@@ -24,7 +24,7 @@ use easytier::{
         scoped_task::ScopedTask,
         stun::MockStunInfoCollector,
     },
-    connector::{create_connector_by_url, dns_connector::DNSTunnelConnector},
+    connector::create_connector_by_url,
     launcher,
     proto::{
         self,
@@ -1087,7 +1087,6 @@ async fn run_main(cli: Cli) -> anyhow::Result<()> {
             hostname,
         );
         tokio::signal::ctrl_c().await.unwrap();
-        DNSTunnelConnector::new("".parse().unwrap(), global_ctx);
         return Ok(());
     }
 
diff --git a/easytier/src/peers/peer.rs b/easytier/src/peers/peer.rs
index b34608f..2fef827 100644
--- a/easytier/src/peers/peer.rs
+++ b/easytier/src/peers/peer.rs
@@ -3,7 +3,7 @@ use std::sync::Arc;
 use crossbeam::atomic::AtomicCell;
 use dashmap::DashMap;
 
-use tokio::{select, sync::mpsc, task::JoinHandle};
+use tokio::{select, sync::mpsc};
 
 use tracing::Instrument;
 
@@ -32,7 +32,7 @@ pub struct Peer {
     packet_recv_chan: PacketRecvChan,
 
     close_event_sender: mpsc::Sender<PeerConnId>,
-    close_event_listener: JoinHandle<()>,
+    close_event_listener: ScopedTask<()>,
 
     shutdown_notifier: Arc<tokio::sync::Notify>,
 
@@ -87,7 +87,8 @@ impl Peer {
                 "peer_close_event_listener",
                 ?peer_node_id,
             )),
-        );
+        )
+        .into();
 
         let default_conn_id = Arc::new(AtomicCell::new(PeerConnId::default()));
 
@@ -188,7 +189,13 @@ impl Peer {
 
         let mut ret = Vec::new();
         for conn in conns {
-            ret.push(conn.get_conn_info());
+            let info = conn.get_conn_info();
+            if !info.is_closed {
+                ret.push(info);
+            } else {
+                let conn_id = info.conn_id.parse().unwrap();
+                let _ = self.close_peer_conn(&conn_id).await;
+            }
         }
         ret
     }
diff --git a/easytier/src/peers/peer_conn.rs b/easytier/src/peers/peer_conn.rs
index 35694b4..b957980 100644
--- a/easytier/src/peers/peer_conn.rs
+++ b/easytier/src/peers/peer_conn.rs
@@ -432,6 +432,7 @@ impl PeerConn {
             loss_rate: (f64::from(self.loss_rate_stats.load(Ordering::Relaxed)) / 100.0) as f32,
             is_client: self.is_client.unwrap_or_default(),
             network_name: info.network_name.clone(),
+            is_closed: self.close_event_notifier.is_closed(),
         }
     }
 }
diff --git a/easytier/src/peers/peer_ospf_route.rs b/easytier/src/peers/peer_ospf_route.rs
index 0207d3a..704ad03 100644
--- a/easytier/src/peers/peer_ospf_route.rs
+++ b/easytier/src/peers/peer_ospf_route.rs
@@ -86,8 +86,9 @@ impl AtomicVersion {
         self.0.fetch_add(1, Ordering::Relaxed) + 1
     }
 
-    fn set_if_larger(&self, version: Version) {
-        self.0.fetch_max(version, Ordering::Relaxed);
+    fn set_if_larger(&self, version: Version) -> bool {
+        // return true if the version is set.
+        self.0.fetch_max(version, Ordering::Relaxed) < version
     }
 }
 
@@ -452,7 +453,6 @@ impl SyncedRouteInfo {
         let mut need_inc_version = false;
 
         for (peer_idx, (peer_id, version)) in conn_bitmap.peer_ids.iter().enumerate() {
-            assert!(self.peer_infos.contains_key(peer_id));
             let connceted_peers = conn_bitmap.get_connected_peers(peer_idx);
             self.fill_empty_peer_info(&connceted_peers);
 
@@ -460,17 +460,14 @@ impl SyncedRouteInfo {
                 .entry(*peer_id)
                 .and_modify(|(old_conn_bitmap, old_version)| {
                     if *version > old_version.get() {
-                        *old_conn_bitmap = conn_bitmap.get_connected_peers(peer_idx);
+                        *old_conn_bitmap = connceted_peers.clone();
                         need_inc_version = true;
                         old_version.set(*version);
                     }
                 })
                 .or_insert_with(|| {
                     need_inc_version = true;
-                    (
-                        conn_bitmap.get_connected_peers(peer_idx),
-                        version.clone().into(),
-                    )
+                    (connceted_peers, version.clone().into())
                 });
         }
         if need_inc_version {
@@ -479,7 +476,6 @@ impl SyncedRouteInfo {
     }
 
     fn update_foreign_network(&self, foreign_network: &RouteForeignNetworkInfos) {
-        let mut need_inc_version = false;
         for item in foreign_network.infos.iter().map(Clone::clone) {
             let Some(key) = item.key else {
                 continue;
@@ -494,14 +490,10 @@ impl SyncedRouteInfo {
                 .entry(key.clone())
                 .and_modify(|old_entry| {
                     if entry.version > old_entry.version {
-                        need_inc_version = true;
                         *old_entry = entry.clone();
                     }
                 })
-                .or_insert_with(|| {
-                    need_inc_version = true;
-                    entry.clone()
-                });
+                .or_insert_with(|| entry.clone());
         }
     }
 
@@ -1069,6 +1061,7 @@ struct PeerRouteServiceImpl {
     foreign_network_owner_map: DashMap<NetworkIdentity, Vec<PeerId>>,
     synced_route_info: SyncedRouteInfo,
     cached_local_conn_map: std::sync::Mutex<RouteConnBitmap>,
+    cached_local_conn_map_version: AtomicVersion,
 
     last_update_my_foreign_network: AtomicCell<Option<std::time::Instant>>,
 
@@ -1118,6 +1111,7 @@ impl PeerRouteServiceImpl {
                 version: AtomicVersion::new(),
             },
             cached_local_conn_map: std::sync::Mutex::new(RouteConnBitmap::new()),
+            cached_local_conn_map_version: AtomicVersion::new(),
 
             last_update_my_foreign_network: AtomicCell::new(None),
 
@@ -1290,6 +1284,8 @@ impl PeerRouteServiceImpl {
         // update route table first because we want to filter out unreachable peers.
         self.update_route_table();
 
+        let synced_version = self.synced_route_info.version.get();
+
         // the conn_bitmap should contain complete list of directly connected peers.
         // use union of dst peers can preserve this property.
         let all_dst_peer_ids = self
@@ -1327,7 +1323,13 @@ impl PeerRouteServiceImpl {
             }
         }
 
-        *self.cached_local_conn_map.lock().unwrap() = conn_bitmap;
+        let mut locked = self.cached_local_conn_map.lock().unwrap();
+        if self
+            .cached_local_conn_map_version
+            .set_if_larger(synced_version)
+        {
+            *locked = conn_bitmap;
+        }
     }
 
     fn build_route_info(&self, session: &SyncRouteSession) -> Option<Vec<RoutePeerInfo>> {
diff --git a/easytier/src/proto/cli.proto b/easytier/src/proto/cli.proto
index 74d80ba..973af45 100644
--- a/easytier/src/proto/cli.proto
+++ b/easytier/src/proto/cli.proto
@@ -30,6 +30,7 @@ message PeerConnInfo {
   float loss_rate = 7;
   bool is_client = 8;
   string network_name = 9;
+  bool is_closed = 10;
 }
 
 message PeerInfo {
diff --git a/easytier/src/tunnel/websocket.rs b/easytier/src/tunnel/websocket.rs
index 2f423d3..f81d4d8 100644
--- a/easytier/src/tunnel/websocket.rs
+++ b/easytier/src/tunnel/websocket.rs
@@ -183,8 +183,6 @@ impl WSTunnelConnector {
     ) -> Result<Box<dyn Tunnel>, TunnelError> {
         let is_wss = is_wss(&addr)?;
         let socket_addr = SocketAddr::from_url(addr.clone(), ip_version).await?;
-        let domain = addr.domain();
-        let host = socket_addr.ip();
         let stream = tcp_socket.connect(socket_addr).await?;
 
         let info = TunnelInfo {
@@ -208,9 +206,7 @@ impl WSTunnelConnector {
             let sni = "localhost";
             let server_name = rustls::pki_types::ServerName::try_from(sni)
                 .map_err(|_| TunnelError::InvalidProtocol("Invalid SNI".to_string()))?;
-            let stream = tls_conn
-                .connect(server_name, stream)
-                .await?;
+            let stream = tls_conn.connect(server_name, stream).await?;
             MaybeTlsStream::Rustls(stream)
         } else {
             MaybeTlsStream::Plain(stream)
diff --git a/easytier/src/utils.rs b/easytier/src/utils.rs
index 1694cb2..e36365c 100644
--- a/easytier/src/utils.rs
+++ b/easytier/src/utils.rs
@@ -205,7 +205,7 @@ pub fn setup_panic_handler() {
 
         // backtrace is risky, so use it last
         let backtrace = backtrace::Backtrace::force_capture();
-        write_err(format!("backtrace: {:?}", backtrace));
+        write_err(format!("backtrace: {:#?}", backtrace));
 
         std::process::exit(1);
     }));