diff --git a/src/config/parse.rs b/src/config/parse.rs
index 74159a8..650a8e7 100644
--- a/src/config/parse.rs
+++ b/src/config/parse.rs
@@ -45,12 +45,17 @@ pub fn parse_opts(globals: &mut Globals, backends: &mut Backends) -> Result<()>
     },
     anyhow!("Wrong port spec.")
   );
-  let mut listen_addresses: Vec<&str> = LISTEN_ADDRESSES_V4.to_vec();
-  if let Some(v) = config.listen_ipv6 {
-    if v {
-      listen_addresses.extend(LISTEN_ADDRESSES_V6.iter());
+  // NOTE: when [::]:xx is bound, both v4 and v6 listeners are enabled.
+  let listen_addresses: Vec<&str> = match config.listen_ipv6 {
+    Some(true) => {
+      info!("Listen both IPv4 and IPv6");
+      LISTEN_ADDRESSES_V6.to_vec()
     }
-  }
+    Some(false) | None => {
+      info!("Listen IPv4");
+      LISTEN_ADDRESSES_V4.to_vec()
+    }
+  };
   globals.listen_sockets = listen_addresses
     .iter()
     .flat_map(|x| {
diff --git a/src/proxy/proxy_main.rs b/src/proxy/proxy_main.rs
index 498df05..e0bdefa 100644
--- a/src/proxy/proxy_main.rs
+++ b/src/proxy/proxy_main.rs
@@ -99,10 +99,7 @@ where
     let listener_service = async {
       // let tcp_listener = TcpListener::bind(&self.listening_on).await?;
       let tcp_listener = self.try_bind_tcp_listener().await?;
-      info!(
-        "Start TCP proxy serving with HTTP request for configured host names: {:?}",
-        tcp_listener.local_addr()?
-      );
+      info!("Start TCP proxy serving with HTTP request for configured host names");
       while let Ok((stream, _client_addr)) = tcp_listener.accept().await {
         self
           .clone()
diff --git a/src/proxy/proxy_tls.rs b/src/proxy/proxy_tls.rs
index 8d7e55c..7384a03 100644
--- a/src/proxy/proxy_tls.rs
+++ b/src/proxy/proxy_tls.rs
@@ -12,7 +12,7 @@ where
   T: Connect + Clone + Sync + Send + 'static,
 {
   pub async fn cert_service(&self) {
-    info!("Start cert watch service for {}", self.listening_on);
+    info!("Start cert watch service");
     loop {
       for (server_name, backend) in self.backends.apps.iter() {
         if backend.tls_cert_key_path.is_some() && backend.tls_cert_path.is_some() {
@@ -29,10 +29,7 @@ where
   pub async fn listener_service(&self, server: Http<LocalExecutor>) -> Result<()> {
     // let tcp_listener = TcpListener::bind(&self.listening_on).await?;
     let tcp_listener = self.try_bind_tcp_listener().await?;
-    info!(
-      "Start TCP proxy serving with HTTPS request for configured host names: {:?}",
-      tcp_listener.local_addr()?
-    );
+    info!("Start TCP proxy serving with HTTPS request for configured host names");
 
     loop {
       select! {
@@ -102,10 +99,7 @@ where
 
     let (endpoint, incoming) = self.try_bind_quic_listener(server_config_h3).await?;
     // quinn::Endpoint::server(server_config_h3, self.listening_on).unwrap();
-    info!(
-      "Start UDP proxy serving with HTTP/3 request for configured host names: {:?}",
-      endpoint.local_addr()?
-    );
+    info!("Start UDP proxy serving with HTTP/3 request for configured host names");
 
     let mut p = incoming.peekable();
     loop {