diff --git a/src/AsyncTCP.cpp b/src/AsyncTCP.cpp
index 0805079..5259400 100644
--- a/src/AsyncTCP.cpp
+++ b/src/AsyncTCP.cpp
@@ -78,7 +78,9 @@ typedef struct {
 
 static xQueueHandle _async_queue;
 static TaskHandle_t _async_service_task_handle = NULL;
-static tcp_pcb * pcb_recently_closed = NULL;
+const int _number_of_closed_slots = CONFIG_LWIP_MAX_ACTIVE_TCP;
+static int _closed_index = 0;
+static int _closed_slots[_number_of_closed_slots];
 
 static inline bool _init_async_event_queue(){
     if(!_async_queue){
@@ -333,6 +335,7 @@ static int8_t _tcp_accept(void * arg, AsyncClient * client) {
 typedef struct {
     struct tcpip_api_call_data call;
     tcp_pcb * pcb;
+    int8_t closed_slot;
     int8_t err;
     union {
             struct {
@@ -357,19 +360,19 @@ typedef struct {
 static err_t _tcp_output_api(struct tcpip_api_call_data *api_call_msg){
     tcp_api_call_t * msg = (tcp_api_call_t *)api_call_msg;
     msg->err = ERR_CONN;
-    if(msg->pcb != pcb_recently_closed) {
+    if(msg->closed_slot == -1 || !_closed_slots[msg->closed_slot]) {
         msg->err = tcp_output(msg->pcb);
     }
-    pcb_recently_closed = NULL;
     return msg->err;
 }
 
-static esp_err_t _tcp_output(tcp_pcb * pcb) {
+static esp_err_t _tcp_output(tcp_pcb * pcb, int8_t closed_slot) {
     if(!pcb){
         return ERR_CONN;
     }
     tcp_api_call_t msg;
     msg.pcb = pcb;
+    msg.closed_slot = closed_slot;
     tcpip_api_call(_tcp_output_api, (struct tcpip_api_call_data*)&msg);
     return msg.err;
 }
@@ -377,19 +380,19 @@ static esp_err_t _tcp_output(tcp_pcb * pcb) {
 static err_t _tcp_write_api(struct tcpip_api_call_data *api_call_msg){
     tcp_api_call_t * msg = (tcp_api_call_t *)api_call_msg;
     msg->err = ERR_CONN;
-    if(msg->pcb != pcb_recently_closed) {
+    if(msg->closed_slot == -1 || !_closed_slots[msg->closed_slot]) {
         msg->err = tcp_write(msg->pcb, msg->write.data, msg->write.size, msg->write.apiflags);
     }
-    pcb_recently_closed = NULL;
     return msg->err;
 }
 
-static esp_err_t _tcp_write(tcp_pcb * pcb, const char* data, size_t size, uint8_t apiflags) {
+static esp_err_t _tcp_write(tcp_pcb * pcb, int8_t closed_slot, const char* data, size_t size, uint8_t apiflags) {
     if(!pcb){
         return ERR_CONN;
     }
     tcp_api_call_t msg;
     msg.pcb = pcb;
+    msg.closed_slot = closed_slot;
     msg.write.data = data;
     msg.write.size = size;
     msg.write.apiflags = apiflags;
@@ -400,20 +403,20 @@ static esp_err_t _tcp_write(tcp_pcb * pcb, const char* data, size_t size, uint8_
 static err_t _tcp_recved_api(struct tcpip_api_call_data *api_call_msg){
     tcp_api_call_t * msg = (tcp_api_call_t *)api_call_msg;
     msg->err = ERR_CONN;
-    if(msg->pcb != pcb_recently_closed) {
+    if(msg->closed_slot == -1 || !_closed_slots[msg->closed_slot]) {
         msg->err = 0;
         tcp_recved(msg->pcb, msg->received);
     }
-    pcb_recently_closed = NULL;
     return msg->err;
 }
 
-static esp_err_t _tcp_recved(tcp_pcb * pcb, size_t len) {
+static esp_err_t _tcp_recved(tcp_pcb * pcb, int8_t closed_slot, size_t len) {
     if(!pcb){
         return ERR_CONN;
     }
     tcp_api_call_t msg;
     msg.pcb = pcb;
+    msg.closed_slot = closed_slot;
     msg.received = len;
     tcpip_api_call(_tcp_recved_api, (struct tcpip_api_call_data*)&msg);
     return msg.err;
@@ -422,19 +425,19 @@ static esp_err_t _tcp_recved(tcp_pcb * pcb, size_t len) {
 static err_t _tcp_close_api(struct tcpip_api_call_data *api_call_msg){
     tcp_api_call_t * msg = (tcp_api_call_t *)api_call_msg;
     msg->err = ERR_CONN;
-    if(msg->pcb != pcb_recently_closed) {
+    if(msg->closed_slot == -1 || !_closed_slots[msg->closed_slot]) {
         msg->err = tcp_close(msg->pcb);
     }
-    pcb_recently_closed = NULL;
     return msg->err;
 }
 
-static esp_err_t _tcp_close(tcp_pcb * pcb) {
+static esp_err_t _tcp_close(tcp_pcb * pcb, int8_t closed_slot) {
     if(!pcb){
         return ERR_CONN;
     }
     tcp_api_call_t msg;
     msg.pcb = pcb;
+    msg.closed_slot = closed_slot;
     tcpip_api_call(_tcp_close_api, (struct tcpip_api_call_data*)&msg);
     return msg.err;
 }
@@ -442,19 +445,19 @@ static esp_err_t _tcp_close(tcp_pcb * pcb) {
 static err_t _tcp_abort_api(struct tcpip_api_call_data *api_call_msg){
     tcp_api_call_t * msg = (tcp_api_call_t *)api_call_msg;
     msg->err = ERR_CONN;
-    if(msg->pcb != pcb_recently_closed) {
+    if(msg->closed_slot == -1 || !_closed_slots[msg->closed_slot]) {
         tcp_abort(msg->pcb);
     }
-    pcb_recently_closed = NULL;
     return msg->err;
 }
 
-static esp_err_t _tcp_abort(tcp_pcb * pcb) {
+static esp_err_t _tcp_abort(tcp_pcb * pcb, int8_t closed_slot) {
     if(!pcb){
         return ERR_CONN;
     }
     tcp_api_call_t msg;
     msg.pcb = pcb;
+    msg.closed_slot = closed_slot;
     tcpip_api_call(_tcp_abort_api, (struct tcpip_api_call_data*)&msg);
     return msg.err;
 }
@@ -465,12 +468,13 @@ static err_t _tcp_connect_api(struct tcpip_api_call_data *api_call_msg){
     return msg->err;
 }
 
-static esp_err_t _tcp_connect(tcp_pcb * pcb, ip_addr_t * addr, uint16_t port, tcp_connected_fn cb) {
+static esp_err_t _tcp_connect(tcp_pcb * pcb, int8_t closed_slot, ip_addr_t * addr, uint16_t port, tcp_connected_fn cb) {
     if(!pcb){
         return ESP_FAIL;
     }
     tcp_api_call_t msg;
     msg.pcb = pcb;
+    msg.closed_slot = closed_slot;
     msg.connect.addr = addr;
     msg.connect.port = port;
     msg.connect.cb = cb;
@@ -490,6 +494,7 @@ static esp_err_t _tcp_bind(tcp_pcb * pcb, ip_addr_t * addr, uint16_t port) {
     }
     tcp_api_call_t msg;
     msg.pcb = pcb;
+    msg.closed_slot = -1;
     msg.bind.addr = addr;
     msg.bind.port = port;
     tcpip_api_call(_tcp_bind_api, (struct tcpip_api_call_data*)&msg);
@@ -509,6 +514,7 @@ static tcp_pcb * _tcp_listen_with_backlog(tcp_pcb * pcb, uint8_t backlog) {
     }
     tcp_api_call_t msg;
     msg.pcb = pcb;
+    msg.closed_slot = -1;
     msg.backlog = backlog?backlog:0xFF;
     tcpip_api_call(_tcp_listen_api, (struct tcpip_api_call_data*)&msg);
     return msg.pcb;
@@ -546,7 +552,25 @@ AsyncClient::AsyncClient(tcp_pcb* pcb)
 , next(NULL)
 {
     _pcb = pcb;
+    _closed_slot = -1;
     if(_pcb){
+        _closed_slot = 0;
+        if (_closed_index == 0) {
+            _closed_index = 1;
+            for (int i = 0; i < _number_of_closed_slots; ++ i) {
+                _closed_slots[i] = 1;
+            }
+        } else {
+            int closed_slot_min_index = _closed_slots[0];
+            for (int i = 0; i < _number_of_closed_slots; ++ i) {
+                if (_closed_slots[i] <= closed_slot_min_index && _closed_slots[i] != 0) {
+                    closed_slot_min_index = _closed_slots[i];
+                    _closed_slot = i;
+                }
+            }
+        }
+        _closed_slots[_closed_slot] = 0;
+
         _rx_last_packet = millis();
         tcp_arg(_pcb, this);
         tcp_recv(_pcb, &_tcp_recv);
@@ -572,6 +596,7 @@ AsyncClient& AsyncClient::operator=(const AsyncClient& other){
     }
 
     _pcb = other._pcb;
+    _closed_slot = other._closed_slot;
     if (_pcb) {
         _rx_last_packet = millis();
         tcp_arg(_pcb, this);
@@ -676,7 +701,7 @@ bool AsyncClient::connect(IPAddress ip, uint16_t port){
     tcp_sent(pcb, &_tcp_sent);
     tcp_poll(pcb, &_tcp_poll, 1);
     //_tcp_connect(pcb, &addr, port,(tcp_connected_fn)&_s_connected);
-    _tcp_connect(pcb, &addr, port,(tcp_connected_fn)&_tcp_connected);
+    _tcp_connect(pcb, _closed_slot, &addr, port,(tcp_connected_fn)&_tcp_connected);
     return true;
 }
 
@@ -702,14 +727,14 @@ bool AsyncClient::connect(const char* host, uint16_t port){
 
 void AsyncClient::close(bool now){
     if(_pcb){
-        _tcp_recved(_pcb, _rx_ack_len);
+        _tcp_recved(_pcb, _closed_slot, _rx_ack_len);
     }
     _close();
 }
 
 int8_t AsyncClient::abort(){
     if(_pcb) {
-        _tcp_abort(_pcb);
+        _tcp_abort(_pcb, _closed_slot );
         _pcb = NULL;
     }
     return ERR_ABRT;
@@ -732,7 +757,7 @@ size_t AsyncClient::add(const char* data, size_t size, uint8_t apiflags) {
     }
     size_t will_send = (room < size) ? room : size;
     int8_t err = ERR_OK;
-    err = _tcp_write(_pcb, data, will_send, apiflags);
+    err = _tcp_write(_pcb, _closed_slot, data, will_send, apiflags);
     if(err != ERR_OK) {
         return 0;
     }
@@ -741,7 +766,7 @@ size_t AsyncClient::add(const char* data, size_t size, uint8_t apiflags) {
 
 bool AsyncClient::send(){
     int8_t err = ERR_OK;
-    err = _tcp_output(_pcb);
+    err = _tcp_output(_pcb, _closed_slot);
     if(err == ERR_OK){
         _pcb_busy = true;
         _pcb_sent_at = millis();
@@ -754,7 +779,7 @@ size_t AsyncClient::ack(size_t len){
     if(len > _rx_ack_len)
         len = _rx_ack_len;
     if(len){
-        _tcp_recved(_pcb, len);
+        _tcp_recved(_pcb, _closed_slot, len);
     }
     _rx_ack_len -= len;
     return len;
@@ -764,7 +789,7 @@ void AsyncClient::ackPacket(struct pbuf * pb){
   if(!pb){
     return;
   }
-  _tcp_recved(_pcb, pb->len);
+  _tcp_recved(_pcb, _closed_slot, pb->len);
   pbuf_free(pb);
 }
 
@@ -783,7 +808,7 @@ int8_t AsyncClient::_close(){
         tcp_err(_pcb, NULL);
         tcp_poll(_pcb, NULL, 0);
         _tcp_clear_events(this);
-        err = _tcp_close(_pcb);
+        err = _tcp_close(_pcb, _closed_slot);
         if(err != ERR_OK) {
             err = abort();
         }
@@ -845,7 +870,8 @@ int8_t AsyncClient::_lwip_fin(tcp_pcb* pcb, int8_t err) {
     if(tcp_close(_pcb) != ERR_OK) {
         tcp_abort(_pcb);
     }
-    pcb_recently_closed = _pcb;
+    _closed_slots[_closed_slot] = _closed_index;
+    ++ _closed_index;
     _pcb = NULL;
     return ERR_OK;
 }
@@ -886,7 +912,7 @@ int8_t AsyncClient::_recv(tcp_pcb* pcb, pbuf* pb, int8_t err) {
             if(!_ack_pcb) {
                 _rx_ack_len += b->len;
             } else if(_pcb) {
-                _tcp_recved(_pcb, b->len);
+                _tcp_recved(_pcb, _closed_slot, b->len);
             }
             pbuf_free(b);
         }
@@ -1233,7 +1259,7 @@ void AsyncServer::begin(){
     err = _tcp_bind(_pcb, &local_addr, _port);
 
     if (err != ERR_OK) {
-        _tcp_close(_pcb);
+        _tcp_close(_pcb, -1);
         log_e("bind error: %d", err);
         return;
     }
@@ -1253,7 +1279,7 @@ void AsyncServer::end(){
         tcp_arg(_pcb, NULL);
         tcp_accept(_pcb, NULL);
         if(tcp_close(_pcb) != ERR_OK){
-            _tcp_abort(_pcb);
+            _tcp_abort(_pcb, -1);
         }
         _pcb = NULL;
     }
diff --git a/src/AsyncTCP.h b/src/AsyncTCP.h
index 05650fc..fef890b 100644
--- a/src/AsyncTCP.h
+++ b/src/AsyncTCP.h
@@ -141,6 +141,7 @@ class AsyncClient {
 
   protected:
     tcp_pcb* _pcb;
+    int8_t  _closed_slot;
 
     AcConnectHandler _connect_cb;
     void* _connect_cb_arg;