diff --git a/tuic-server/src/connection/mod.rs b/tuic-server/src/connection/mod.rs
index eacd2f5..3abe1a1 100644
--- a/tuic-server/src/connection/mod.rs
+++ b/tuic-server/src/connection/mod.rs
@@ -103,10 +103,9 @@ impl Connection {
 
                     match handle_incoming.await {
                         Ok(()) => {}
-                        Err(err) if err.is_locally_closed() => {}
-                        Err(err) if err.is_timeout_closed() => {
+                        Err(err) if err.is_locally_closed() || err.is_timeout_closed() => {
                             log::debug!(
-                                "[{id:#010x}] [{addr}] [{user}] connection timeout",
+                                "[{id:#010x}] [{addr}] [{user}] {err}",
                                 id = conn.id(),
                                 user = conn.auth,
                             );
@@ -119,7 +118,9 @@ impl Connection {
                     }
                 }
             }
-            Err(err) if err.is_locally_closed() || err.is_timeout_closed() => unreachable!(),
+            Err(err) if err.is_locally_closed() || err.is_timeout_closed() => {
+                log::debug!("[{id:#010x}] [{addr}] [unauthenticated] {err}", id = 0);
+            }
             Err(err) => {
                 log::warn!(
                     "[{id:#010x}] [{addr}] [unauthenticated] connection establishing error: {err}",