diff --git a/adb/adb.h b/adb/adb.h
index cb38e61..9227eb1 100644
--- a/adb/adb.h
+++ b/adb/adb.h
@@ -188,7 +188,7 @@
 
 
 void local_init(int port);
-void local_connect(int port);
+bool local_connect(int port);
 int  local_connect_arbitrary_ports(int console_port, int adb_port, std::string* error);
 
 // USB host/client interface.
diff --git a/adb/sysdeps/condition_variable.h b/adb/sysdeps/condition_variable.h
new file mode 100644
index 0000000..117cd40
--- /dev/null
+++ b/adb/sysdeps/condition_variable.h
@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <condition_variable>
+
+#include "sysdeps/mutex.h"
+
+#if defined(_WIN32)
+
+#include <windows.h>
+
+#include <android-base/macros.h>
+
+// The prebuilt version of mingw we use doesn't support condition_variable.
+// Therefore, implement our own using the Windows primitives.
+// Put them directly into the std namespace, so that when they're actually available, the build
+// breaks until they're removed.
+
+namespace std {
+
+class condition_variable {
+  public:
+    condition_variable() {
+        InitializeConditionVariable(&cond_);
+    }
+
+    void wait(std::unique_lock<std::mutex>& lock) {
+        std::mutex *m = lock.mutex();
+        m->lock_count_--;
+        SleepConditionVariableCS(&cond_, m->native_handle(), INFINITE);
+        m->lock_count_++;
+    }
+
+    void notify_one() {
+        WakeConditionVariable(&cond_);
+    }
+
+  private:
+    CONDITION_VARIABLE cond_;
+
+    DISALLOW_COPY_AND_ASSIGN(condition_variable);
+};
+
+}
+
+#endif  // defined(_WIN32)
diff --git a/adb/sysdeps/mutex.h b/adb/sysdeps/mutex.h
index 73c9e6e..226f7f1 100644
--- a/adb/sysdeps/mutex.h
+++ b/adb/sysdeps/mutex.h
@@ -1,5 +1,3 @@
-#pragma once
-
 /*
  * Copyright (C) 2016 The Android Open Source Project
  *
@@ -16,6 +14,7 @@
  * limitations under the License.
  */
 
+#pragma once
 #if defined(_WIN32)
 
 #include <windows.h>
@@ -35,34 +34,42 @@
 // CRITICAL_SECTION is recursive, so just wrap it in a Mutex-compatible class.
 class recursive_mutex {
   public:
+    typedef CRITICAL_SECTION* native_handle_type;
+
     recursive_mutex() {
-        InitializeCriticalSection(&mutex_);
+        InitializeCriticalSection(&cs_);
     }
 
     ~recursive_mutex() {
-        DeleteCriticalSection(&mutex_);
+        DeleteCriticalSection(&cs_);
     }
 
     void lock() {
-        EnterCriticalSection(&mutex_);
+        EnterCriticalSection(&cs_);
     }
 
     bool try_lock() {
-        return TryEnterCriticalSection(&mutex_);
+        return TryEnterCriticalSection(&cs_);
     }
 
     void unlock() {
-        LeaveCriticalSection(&mutex_);
+        LeaveCriticalSection(&cs_);
+    }
+
+    native_handle_type native_handle() {
+        return &cs_;
     }
 
   private:
-    CRITICAL_SECTION mutex_;
+    CRITICAL_SECTION cs_;
 
     DISALLOW_COPY_AND_ASSIGN(recursive_mutex);
 };
 
 class mutex {
   public:
+    typedef CRITICAL_SECTION* native_handle_type;
+
     mutex() {
     }
 
@@ -97,11 +104,17 @@
         return true;
     }
 
+    native_handle_type native_handle() {
+        return mutex_.native_handle();
+    }
+
   private:
     recursive_mutex mutex_;
     size_t lock_count_ = 0;
+
+    friend class condition_variable;
 };
 
 }
 
-#endif
+#endif  // defined(_WIN32)
diff --git a/adb/sysdeps_test.cpp b/adb/sysdeps_test.cpp
index 395d22d..740f283 100644
--- a/adb/sysdeps_test.cpp
+++ b/adb/sysdeps_test.cpp
@@ -20,6 +20,8 @@
 
 #include "adb_io.h"
 #include "sysdeps.h"
+#include "sysdeps/condition_variable.h"
+#include "sysdeps/mutex.h"
 
 static void increment_atomic_int(void* c) {
     sleep(1);
@@ -245,7 +247,6 @@
     }
 }
 
-#include "sysdeps/mutex.h"
 TEST(sysdeps_mutex, mutex_smoke) {
     static std::atomic<bool> finished(false);
     static std::mutex &m = *new std::mutex();
@@ -301,3 +302,21 @@
     m.lock();
     m.unlock();
 }
+
+TEST(sysdeps_condition_variable, smoke) {
+    static std::mutex &m = *new std::mutex;
+    static std::condition_variable &cond = *new std::condition_variable;
+    static volatile bool flag = false;
+
+    std::unique_lock<std::mutex> lock(m);
+    adb_thread_create([](void*) {
+        m.lock();
+        flag = true;
+        cond.notify_one();
+        m.unlock();
+    }, nullptr);
+
+    while (!flag) {
+        cond.wait(lock);
+    }
+}
diff --git a/adb/transport.cpp b/adb/transport.cpp
index 55082a5..65b05b8 100644
--- a/adb/transport.cpp
+++ b/adb/transport.cpp
@@ -952,6 +952,8 @@
     for (const auto& transport : pending_list) {
         if (transport->serial && strcmp(serial, transport->serial) == 0) {
             adb_mutex_unlock(&transport_lock);
+            VLOG(TRANSPORT) << "socket transport " << transport->serial
+                << " is already in pending_list and fails to register";
             delete t;
             return -1;
         }
@@ -960,6 +962,8 @@
     for (const auto& transport : transport_list) {
         if (transport->serial && strcmp(serial, transport->serial) == 0) {
             adb_mutex_unlock(&transport_lock);
+            VLOG(TRANSPORT) << "socket transport " << transport->serial
+                << " is already in transport_list and fails to register";
             delete t;
             return -1;
         }
@@ -992,8 +996,7 @@
 void kick_all_tcp_devices() {
     adb_mutex_lock(&transport_lock);
     for (auto& t : transport_list) {
-        // TCP/IP devices have adb_port == 0.
-        if (t->type == kTransportLocal && t->adb_port == 0) {
+        if (t->IsTcpDevice()) {
             // Kicking breaks the read_transport thread of this transport out of any read, then
             // the read_transport thread will notify the main thread to make this transport
             // offline. Then the main thread will notify the write_transport thread to exit.
diff --git a/adb/transport.h b/adb/transport.h
index 35d7b50..46d472b 100644
--- a/adb/transport.h
+++ b/adb/transport.h
@@ -87,7 +87,22 @@
     char* model = nullptr;
     char* device = nullptr;
     char* devpath = nullptr;
-    int adb_port = -1;  // Use for emulators (local transport)
+    void SetLocalPortForEmulator(int port) {
+        CHECK_EQ(local_port_for_emulator_, -1);
+        local_port_for_emulator_ = port;
+    }
+
+    bool GetLocalPortForEmulator(int* port) const {
+        if (type == kTransportLocal && local_port_for_emulator_ != -1) {
+            *port = local_port_for_emulator_;
+            return true;
+        }
+        return false;
+    }
+
+    bool IsTcpDevice() const {
+        return type == kTransportLocal && local_port_for_emulator_ == -1;
+    }
 
     void* key = nullptr;
     unsigned char token[TOKEN_SIZE] = {};
@@ -128,6 +143,7 @@
     bool MatchesTarget(const std::string& target) const;
 
 private:
+    int local_port_for_emulator_ = -1;
     bool kicked_ = false;
     void (*kick_func_)(atransport*) = nullptr;
 
diff --git a/adb/transport_local.cpp b/adb/transport_local.cpp
index c1c88a9..31b5ad6 100644
--- a/adb/transport_local.cpp
+++ b/adb/transport_local.cpp
@@ -17,6 +17,8 @@
 #define TRACE_TAG TRANSPORT
 
 #include "sysdeps.h"
+#include "sysdeps/condition_variable.h"
+#include "sysdeps/mutex.h"
 #include "transport.h"
 
 #include <errno.h>
@@ -25,6 +27,8 @@
 #include <string.h>
 #include <sys/types.h>
 
+#include <vector>
+
 #include <android-base/stringprintf.h>
 #include <cutils/sockets.h>
 
@@ -85,9 +89,9 @@
     return 0;
 }
 
-void local_connect(int port) {
+bool local_connect(int port) {
     std::string dummy;
-    local_connect_arbitrary_ports(port-1, port, &dummy);
+    return local_connect_arbitrary_ports(port-1, port, &dummy) == 0;
 }
 
 int local_connect_arbitrary_ports(int console_port, int adb_port, std::string* error) {
@@ -121,18 +125,71 @@
 }
 
 #if ADB_HOST
+
+static void PollAllLocalPortsForEmulator() {
+    int port = DEFAULT_ADB_LOCAL_TRANSPORT_PORT;
+    int count = ADB_LOCAL_TRANSPORT_MAX;
+
+    // Try to connect to any number of running emulator instances.
+    for ( ; count > 0; count--, port += 2 ) {
+        local_connect(port);
+    }
+}
+
+// Retry the disconnected local port for 60 times, and sleep 1 second between two retries.
+constexpr uint32_t LOCAL_PORT_RETRY_COUNT = 60;
+constexpr uint32_t LOCAL_PORT_RETRY_INTERVAL_IN_MS = 1000;
+
+struct RetryPort {
+    int port;
+    uint32_t retry_count;
+};
+
+// Retry emulators just kicked.
+static std::vector<RetryPort>& retry_ports = *new std::vector<RetryPort>;
+std::mutex &retry_ports_lock = *new std::mutex;
+std::condition_variable &retry_ports_cond = *new std::condition_variable;
+
 static void client_socket_thread(void* x) {
     adb_thread_setname("client_socket_thread");
     D("transport: client_socket_thread() starting");
+    PollAllLocalPortsForEmulator();
     while (true) {
-        int port = DEFAULT_ADB_LOCAL_TRANSPORT_PORT;
-        int count = ADB_LOCAL_TRANSPORT_MAX;
-
-        // Try to connect to any number of running emulator instances.
-        for ( ; count > 0; count--, port += 2 ) {
-            local_connect(port);
+        std::vector<RetryPort> ports;
+        // Collect retry ports.
+        {
+            std::unique_lock<std::mutex> lock(retry_ports_lock);
+            while (retry_ports.empty()) {
+                retry_ports_cond.wait(lock);
+            }
+            retry_ports.swap(ports);
         }
-        sleep(1);
+        // Sleep here instead of the end of loop, because if we immediately try to reconnect
+        // the emulator just kicked, the adbd on the emulator may not have time to remove the
+        // just kicked transport.
+        adb_sleep_ms(LOCAL_PORT_RETRY_INTERVAL_IN_MS);
+
+        // Try connecting retry ports.
+        std::vector<RetryPort> next_ports;
+        for (auto& port : ports) {
+            VLOG(TRANSPORT) << "retry port " << port.port << ", last retry_count "
+                << port.retry_count;
+            if (local_connect(port.port)) {
+                VLOG(TRANSPORT) << "retry port " << port.port << " successfully";
+                continue;
+            }
+            if (--port.retry_count > 0) {
+                next_ports.push_back(port);
+            } else {
+                VLOG(TRANSPORT) << "stop retrying port " << port.port;
+            }
+        }
+
+        // Copy back left retry ports.
+        {
+            std::unique_lock<std::mutex> lock(retry_ports_lock);
+            retry_ports.insert(retry_ports.end(), next_ports.begin(), next_ports.end());
+        }
     }
 }
 
@@ -341,17 +398,32 @@
         t->sfd = -1;
         adb_close(fd);
     }
+#if ADB_HOST
+    int local_port;
+    if (t->GetLocalPortForEmulator(&local_port)) {
+        VLOG(TRANSPORT) << "remote_close, local_port = " << local_port;
+        std::unique_lock<std::mutex> lock(retry_ports_lock);
+        RetryPort port;
+        port.port = local_port;
+        port.retry_count = LOCAL_PORT_RETRY_COUNT;
+        retry_ports.push_back(port);
+        retry_ports_cond.notify_one();
+    }
+#endif
 }
 
 
 #if ADB_HOST
 /* Only call this function if you already hold local_transports_lock. */
-atransport* find_emulator_transport_by_adb_port_locked(int adb_port)
+static atransport* find_emulator_transport_by_adb_port_locked(int adb_port)
 {
     int i;
     for (i = 0; i < ADB_LOCAL_TRANSPORT_MAX; i++) {
-        if (local_transports[i] && local_transports[i]->adb_port == adb_port) {
-            return local_transports[i];
+        int local_port;
+        if (local_transports[i] && local_transports[i]->GetLocalPortForEmulator(&local_port)) {
+            if (local_port == adb_port) {
+                return local_transports[i];
+            }
         }
     }
     return NULL;
@@ -398,13 +470,12 @@
     t->sync_token = 1;
     t->connection_state = kCsOffline;
     t->type = kTransportLocal;
-    t->adb_port = 0;
 
 #if ADB_HOST
     if (local) {
         adb_mutex_lock( &local_transports_lock );
         {
-            t->adb_port = adb_port;
+            t->SetLocalPortForEmulator(adb_port);
             atransport* existing_transport =
                     find_emulator_transport_by_adb_port_locked(adb_port);
             int index = get_available_local_transport_index_locked();