diff --git a/HttpServer/Server.php b/HttpServer/Server.php
index 8eed443e..88b86c46 100644
--- a/HttpServer/Server.php
+++ b/HttpServer/Server.php
@@ -175,13 +175,7 @@ class Server extends HttpService
 			return false;
 		}
 		foreach ($port as $value) {
-			if (Snowflake::getPlatform()->isLinux()) {
-				exec('netstat -tunlp | grep ' . $value['port'], $output);
-			} else {
-				exec('lsof -i :' . $value['port'] . ' | grep -i "LISTEN"', $output);
-			}
-			if (!empty($output)) {
-				unset($output);
+			if ($this->checkPort($value['port'])) {
 				return true;
 			}
 		}
@@ -189,6 +183,22 @@ class Server extends HttpService
 	}
 
 
+	/**
+	 * @param $port
+	 * @return bool
+	 * @throws Exception
+	 */
+	private function checkPort($port): bool
+	{
+		if (Snowflake::getPlatform()->isLinux()) {
+			exec('netstat -tunlp | grep ' . $port, $output);
+		} else {
+			exec('lsof -i :' . $port . ' | grep -i "LISTEN"', $output);
+		}
+		return !empty($output);
+	}
+
+
 	/**
 	 * @return void
 	 *
@@ -312,7 +322,7 @@ class Server extends HttpService
 	 */
 	private function dispatchCreate($config, $settings): \Swoole\Server|Packet|Receive|Http|Websocket|null
 	{
-		if ($this->isUse($config['port'])) {
+		if (Snowflake::port_already($config['port'])) {
 			return $this->error_stop($config['host'], $config['port']);
 		}
 		if (!($this->baseServer instanceof \Swoole\Server)) {
diff --git a/Rpc/Service.php b/Rpc/Service.php
index ae85ce22..af902a80 100644
--- a/Rpc/Service.php
+++ b/Rpc/Service.php
@@ -57,6 +57,12 @@ class Service extends Component
 	private function addService($router, $server, $service)
 	{
 		$mode = $service['mode'] ?? SWOOLE_SOCK_TCP6;
+
+		if (Snowflake::port_already($service['port'])) {
+			throw new Exception(sprintf('Port %s::%d is already.', $service['host'], $service['port']));
+		}
+		$this->debug(sprintf('Port %s::%d is already.', $service['host'], $service['port']));
+
 		$rpcServer = $server->addlistener($service['host'], $service['port'], $mode);
 		$rpcServer->set([
 			'open_tcp_keepalive'      => true,
diff --git a/System/Snowflake.php b/System/Snowflake.php
index 5fb60ed7..5ed8529d 100644
--- a/System/Snowflake.php
+++ b/System/Snowflake.php
@@ -83,6 +83,25 @@ class Snowflake
 	}
 
 
+	/**
+	 * @param $port
+	 * @return bool|array
+	 * @throws Exception
+	 */
+	public static function port_already($port): bool
+	{
+		if (empty($port)) {
+			return false;
+		}
+		if (Snowflake::getPlatform()->isLinux()) {
+			exec('netstat -tunlp | grep ' . $port, $output);
+		} else {
+			exec('lsof -i :' . $port . ' | grep -i "LISTEN"', $output);
+		}
+		return !empty($output);
+	}
+
+
 	/**
 	 * @param $className
 	 * @param array $construct