diff --git a/tuic-server/src/config.rs b/tuic-server/src/config.rs
index e409ffe..de01b6c 100644
--- a/tuic-server/src/config.rs
+++ b/tuic-server/src/config.rs
@@ -106,7 +106,7 @@ mod default {
     }
 
     pub fn auth_timeout() -> Duration {
-        Duration::from_secs(3)
+        Duration::from_secs(10)
     }
 
     pub fn max_idle_time() -> Duration {
diff --git a/tuic-server/src/main.rs b/tuic-server/src/main.rs
index 9e689a3..1b8d039 100644
--- a/tuic-server/src/main.rs
+++ b/tuic-server/src/main.rs
@@ -29,7 +29,11 @@ async fn main() {
         }
     };
 
-    LoggerBuilder::new().filter_level(cfg.log_level).init();
+    LoggerBuilder::new()
+        .filter_level(cfg.log_level)
+        .format_module_path(false)
+        .format_target(false)
+        .init();
 
     match Server::init(cfg) {
         Ok(server) => server.start().await,
diff --git a/tuic-server/src/server.rs b/tuic-server/src/server.rs
index 1f35e56..b6c3204 100644
--- a/tuic-server/src/server.rs
+++ b/tuic-server/src/server.rs
@@ -8,8 +8,8 @@ use crossbeam_utils::atomic::AtomicCell;
 use parking_lot::Mutex;
 use quinn::{
     congestion::{BbrConfig, CubicConfig, NewRenoConfig},
-    Connecting, Connection as QuinnConnection, Endpoint, EndpointConfig, IdleTimeout, RecvStream,
-    SendStream, ServerConfig, TokioRuntime, TransportConfig, VarInt,
+    Connecting, Connection as QuinnConnection, ConnectionError, Endpoint, EndpointConfig,
+    IdleTimeout, RecvStream, SendStream, ServerConfig, TokioRuntime, TransportConfig, VarInt,
 };
 use register_count::{Counter, Register};
 use rustls::{version, ServerConfig as RustlsServerConfig};
@@ -135,8 +135,15 @@ impl Server {
     }
 
     pub async fn start(&self) {
+        log::warn!(
+            "server started, listening on {}",
+            self.ep.local_addr().unwrap()
+        );
+
         loop {
-            let conn = self.ep.accept().await.unwrap();
+            let Some(conn) = self.ep.accept().await else {
+                return;
+            };
 
             tokio::spawn(Connection::handle(
                 conn,
@@ -180,16 +187,21 @@ impl Connection {
         gc_interval: Duration,
         gc_lifetime: Duration,
     ) {
-        match Self::init(
+        let addr = conn.remote_address();
+
+        let conn = Self::init(
             conn,
             users,
             udp_relay_ipv6,
             zero_rtt_handshake,
             max_external_pkt_size,
         )
-        .await
-        {
+        .await;
+
+        match conn {
             Ok(conn) => {
+                log::info!("[{addr}] connection established");
+
                 tokio::spawn(conn.clone().handle_auth_timeout(auth_timeout));
                 tokio::spawn(conn.clone().collect_garbage(gc_interval, gc_lifetime));
 
@@ -200,11 +212,17 @@ impl Connection {
 
                     match conn.accept().await {
                         Ok(()) => {}
-                        Err(err) => eprintln!("{err}"),
+                        Err(err) if err.is_locally_closed() => {}
+                        Err(err) if err.is_timeout_closed() => {
+                            log::debug!("[{addr}] connection timeout")
+                        }
+                        Err(err) => log::warn!("[{addr}] {err}"),
                     }
                 }
             }
-            Err(err) => eprintln!("{err}"),
+            Err(err) if err.is_locally_closed() => unreachable!(),
+            Err(err) if err.is_timeout_closed() => log::debug!("[{addr}] connection timeout"),
+            Err(err) => log::warn!("[{addr}] {err}"),
         }
     }
 
@@ -219,7 +237,7 @@ impl Connection {
             match conn.into_0rtt() {
                 Ok((conn, _)) => conn,
                 Err(conn) => {
-                    eprintln!("0-RTT handshake failed, fallback to 1-RTT handshake");
+                    log::info!("0-RTT handshake failed, fallback to 1-RTT handshake");
                     conn.await?
                 }
             }
@@ -257,6 +275,9 @@ impl Connection {
     }
 
     async fn handle_uni_stream(self, recv: RecvStream, _reg: Register) {
+        let addr = self.inner.remote_address();
+        log::debug!("[{addr}] incoming unidirectional stream");
+
         let max = self.max_concurrent_uni_streams.load(Ordering::Relaxed);
 
         if self.remote_uni_stream_cnt.count() == max {
@@ -299,27 +320,44 @@ impl Connection {
         }
 
         match pre_process(&self, recv).await {
-            Ok(Task::Authenticate(_)) => {}
+            Ok(Task::Authenticate(auth)) => log::info!("[{addr}] authenticated as {}", auth.uuid()),
             Ok(Task::Packet(pkt)) => {
+                let assoc_id = pkt.assoc_id();
+                let pkt_id = pkt.pkt_id();
+                let frag_id = pkt.frag_id();
+                let frag_total = pkt.frag_total();
+                log::info!(
+                    "[{addr}] [packet-from-quic] [{assoc_id}] [{pkt_id}] [{frag_id}:{frag_total}]"
+                );
+
                 self.set_udp_relay_mode(UdpRelayMode::Quic);
                 match self.handle_packet(pkt).await {
                     Ok(()) => {}
-                    Err(err) => eprintln!("{err}"),
+                    Err(err) => log::warn!(
+                        "[{addr}] [packet-from-quic] [{assoc_id}] [{pkt_id}] [{frag_id}:{frag_total}] {err}"
+                    ),
+                }
+            }
+            Ok(Task::Dissociate(assoc_id)) => {
+                log::info!("[{addr}] [dissociate] [{assoc_id}]");
+
+                match self.handle_dissociate(assoc_id).await {
+                    Ok(()) => {}
+                    Err(err) => log::warn!("[{addr}] [dissociate] [{assoc_id}] {err}"),
                 }
             }
-            Ok(Task::Dissociate(assoc_id)) => match self.handle_dissociate(assoc_id).await {
-                Ok(()) => {}
-                Err(err) => eprintln!("{err}"),
-            },
             Ok(_) => unreachable!(),
             Err(err) => {
-                eprintln!("{err}");
+                log::warn!("[{addr}] handle unidirection stream error: {err}");
                 self.close();
             }
         }
     }
 
     async fn handle_bi_stream(self, (send, recv): (SendStream, RecvStream), _reg: Register) {
+        let addr = self.inner.remote_address();
+        log::debug!("[{addr}] incoming bidirectional stream");
+
         let max = self.max_concurrent_bi_streams.load(Ordering::Relaxed);
 
         if self.remote_bi_stream_cnt.count() == max {
@@ -346,19 +384,27 @@ impl Connection {
         }
 
         match pre_process(&self, send, recv).await {
-            Ok(Task::Connect(conn)) => match self.handle_connect(conn).await {
-                Ok(()) => {}
-                Err(err) => eprintln!("{err}"),
-            },
+            Ok(Task::Connect(conn)) => {
+                let target_addr = conn.addr().to_string();
+                log::info!("[{addr}] [connect] [{target_addr}]");
+
+                match self.handle_connect(conn).await {
+                    Ok(()) => {}
+                    Err(err) => log::warn!("[{addr}] [connect] [{target_addr}] {err}"),
+                }
+            }
             Ok(_) => unreachable!(),
             Err(err) => {
-                eprintln!("{err}");
+                log::warn!("[{addr}] handle bidirection stream error: {err}");
                 self.close();
             }
         }
     }
 
     async fn handle_datagram(self, dg: Bytes) {
+        let addr = self.inner.remote_address();
+        log::debug!("[{addr}] incoming datagram");
+
         async fn pre_process(conn: &Connection, dg: Bytes) -> Result<Task, Error> {
             let task = conn.model.accept_datagram(dg)?;
 
@@ -378,16 +424,26 @@ impl Connection {
 
         match pre_process(&self, dg).await {
             Ok(Task::Packet(pkt)) => {
+                let assoc_id = pkt.assoc_id();
+                let pkt_id = pkt.pkt_id();
+                let frag_id = pkt.frag_id();
+                let frag_total = pkt.frag_total();
+                log::info!(
+                    "[{addr}] [packet-from-native] [{assoc_id}] [{pkt_id}] [{frag_id}:{frag_total}]"
+                );
+
                 self.set_udp_relay_mode(UdpRelayMode::Native);
                 match self.handle_packet(pkt).await {
                     Ok(()) => {}
-                    Err(err) => eprintln!("{err}"),
+                    Err(err) => log::warn!(
+                        "[{addr}] [packet-from-native] [{assoc_id}] [{pkt_id}] [{frag_id}:{frag_total}] {err}"
+                    ),
                 }
             }
-            Ok(Task::Heartbeat) => {}
+            Ok(Task::Heartbeat) => log::info!("[{addr}] [heartbeat]"),
             Ok(_) => unreachable!(),
             Err(err) => {
-                eprintln!("{err}");
+                log::warn!("[{addr}] handle datagram error: {err}");
                 self.close();
             }
         }
@@ -468,6 +524,8 @@ impl Connection {
         time::sleep(timeout).await;
 
         if !self.is_authed() {
+            let addr = self.inner.remote_address();
+            log::warn!("[{addr}] authentication timeout");
             self.close();
         }
     }
@@ -570,20 +628,32 @@ impl UdpSession {
         socket_v6: Option<Arc<UdpSocket>>,
         cancel: Receiver<()>,
     ) {
-        async fn send_pkt(conn: Connection, pkt: Bytes, addr: SocketAddr, assoc_id: u16) {
-            let addr = Address::SocketAddress(addr);
+        async fn send_pkt(conn: Connection, pkt: Bytes, target_addr: SocketAddr, assoc_id: u16) {
+            let addr = conn.inner.remote_address();
+            let target_addr_tuic = Address::SocketAddress(target_addr);
 
             let res = match conn.get_udp_relay_mode() {
-                Some(UdpRelayMode::Native) => conn.model.packet_native(pkt, addr, assoc_id),
-                Some(UdpRelayMode::Quic) => conn.model.packet_quic(pkt, addr, assoc_id).await,
+                Some(UdpRelayMode::Native) => {
+                    log::info!("[{addr}] [packet-to-native] [{assoc_id}] [{target_addr_tuic}]");
+                    conn.model.packet_native(pkt, target_addr_tuic, assoc_id)
+                }
+                Some(UdpRelayMode::Quic) => {
+                    log::info!("[{addr}] [packet-to-quic] [{assoc_id}] [{target_addr_tuic}]");
+                    conn.model
+                        .packet_quic(pkt, target_addr_tuic, assoc_id)
+                        .await
+                }
                 None => unreachable!(),
             };
 
             if let Err(err) = res {
-                eprintln!("{err}");
+                let target_addr_tuic = Address::SocketAddress(target_addr);
+                log::warn!("[{addr}] [packet-to-quic] [{assoc_id}] [{target_addr_tuic}] {err}");
             }
         }
 
+        let addr = conn.inner.remote_address();
+
         tokio::select! {
             _ = cancel => {}
             () = async {
@@ -593,10 +663,10 @@ impl UdpSession {
                         socket_v6.as_deref(),
                         conn.max_external_pkt_size,
                     ).await {
-                        Ok((pkt, addr)) => {
-                            tokio::spawn(send_pkt(conn.clone(), pkt, addr, assoc_id));
+                        Ok((pkt, target_addr)) => {
+                            tokio::spawn(send_pkt(conn.clone(), pkt, target_addr, assoc_id));
                         }
-                        Err(err) => eprintln!("{err}"),
+                        Err(err) => log::warn!("[{addr}] [packet-to-*] [{assoc_id}] {err}"),
                     }
                 }
             } => unreachable!(),
@@ -674,3 +744,13 @@ impl Future for IsAuthed {
         }
     }
 }
+
+impl Error {
+    fn is_locally_closed(&self) -> bool {
+        matches!(self, Self::Connection(ConnectionError::LocallyClosed))
+    }
+
+    fn is_timeout_closed(&self) -> bool {
+        matches!(self, Self::Connection(ConnectionError::TimedOut))
+    }
+}