diff --git a/src/common.rs b/src/common.rs
index d74ecac8b..977c26832 100644
--- a/src/common.rs
+++ b/src/common.rs
@@ -507,6 +507,16 @@ audio_rechannel!(audio_rechannel_8_7, 8, 7);
 pub fn test_nat_type() {
     let mut i = 0;
     std::thread::spawn(move || loop {
+        if i == 0 {
+            #[cfg(not(any(target_os = "android", target_os = "ios")))]
+            let is_direct = crate::ipc::get_socks().is_none(); // sync socks BTW
+            #[cfg(any(target_os = "android", target_os = "ios"))]
+            let is_direct = Config::get_socks().is_none(); // sync socks BTW
+            if !is_direct {
+                Config::set_nat_type(NatType::SYMMETRIC as _);
+                break;
+            }
+        }
         match test_nat_type_() {
             Ok(true) => break,
             Err(err) => {
@@ -528,14 +538,6 @@ pub fn test_nat_type() {
 #[tokio::main(flavor = "current_thread")]
 async fn test_nat_type_() -> ResultType<bool> {
     log::info!("Testing nat ...");
-    #[cfg(not(any(target_os = "android", target_os = "ios")))]
-    let is_direct = crate::ipc::get_socks_async(1_000).await.is_none(); // sync socks BTW
-    #[cfg(any(target_os = "android", target_os = "ios"))]
-    let is_direct = Config::get_socks().is_none(); // sync socks BTW
-    if !is_direct {
-        Config::set_nat_type(NatType::SYMMETRIC as _);
-        return Ok(true);
-    }
     let start = std::time::Instant::now();
     let (rendezvous_server, _, _) = get_rendezvous_server(1_000).await;
     let server1 = rendezvous_server;
diff --git a/src/rendezvous_mediator.rs b/src/rendezvous_mediator.rs
index 135352e68..d53fd0e05 100644
--- a/src/rendezvous_mediator.rs
+++ b/src/rendezvous_mediator.rs
@@ -65,13 +65,9 @@ impl RendezvousMediator {
         if crate::platform::is_installed() && !crate::is_custom_client() {
             crate::updater::start_auto_update();
         }
-        let mut nat_tested = false;
         check_zombie();
         let server = new_server();
-        if Config::get_nat_type() == NatType::UNKNOWN_NAT as i32 {
-            crate::test_nat_type();
-            nat_tested = true;
-        }
+        crate::test_nat_type();
         if config::option2bool("stop-service", &Config::get_option("stop-service")) {
             crate::test_rendezvous_server();
         }
@@ -100,10 +96,6 @@ impl RendezvousMediator {
             if !config::option2bool("stop-service", &Config::get_option("stop-service"))
                 && !crate::platform::installing_service()
             {
-                if !nat_tested {
-                    crate::test_nat_type();
-                    nat_tested = true;
-                }
                 let mut futs = Vec::new();
                 let servers = Config::get_rendezvous_servers();
                 SHOULD_EXIT.store(false, Ordering::SeqCst);