diff --git a/jetbra-agent/src/main/java/win/novice/li/AgentMain.java b/jetbra-agent/src/main/java/win/novice/li/AgentMain.java
index ce29191..b6c42fb 100644
--- a/jetbra-agent/src/main/java/win/novice/li/AgentMain.java
+++ b/jetbra-agent/src/main/java/win/novice/li/AgentMain.java
@@ -21,11 +21,19 @@ public class AgentMain {
                         .visit(Advice.to(HttpClientAdvice.class)
                                 .on(ElementMatchers.named("openServer"))))
                 .asTerminalTransformation()
+
                 .type(ElementMatchers.named("java.lang.System"))
                 .transform((builder, typeDescription, classLoader, module, protectionDomain) -> builder
                         .visit(Advice.to(SystemAdvice.class)
                                 .on(ElementMatchers.named("getProperty"))))
                 .asTerminalTransformation()
+
+                .type(ElementMatchers.named("java.net.Socket"))
+                .transform((builder, typeDescription, classLoader, module, protectionDomain) -> builder
+                        .visit(Advice.to(SocketAdvice.class)
+                                .on(ElementMatchers.named("connect"))))
+                .asTerminalTransformation()
+
                 .installOn(inst);
 
         agentBuilder.installOn(inst);
diff --git a/jetbra-agent/src/main/java/win/novice/li/SocketAdvice.java b/jetbra-agent/src/main/java/win/novice/li/SocketAdvice.java
new file mode 100644
index 0000000..ba12ef6
--- /dev/null
+++ b/jetbra-agent/src/main/java/win/novice/li/SocketAdvice.java
@@ -0,0 +1,20 @@
+package win.novice.li;
+
+import net.bytebuddy.asm.Advice;
+
+import java.net.ConnectException;
+import java.net.InetAddress;
+import java.net.InetSocketAddress;
+import java.net.SocketAddress;
+
+public class SocketAdvice {
+    @Advice.OnMethodExit
+    public static void intercept(@Advice.Argument(value = 0,readOnly = false) SocketAddress socketAddress) throws Exception {
+        if (socketAddress instanceof InetSocketAddress){
+            InetAddress address = ((InetSocketAddress) socketAddress).getAddress();
+            if (address.getHostAddress().equals("116.62.33.138")){
+                throw new ConnectException("拒绝连接");
+            }
+        }
+    }
+}
diff --git a/jetbra-server/src/main/java/win/novice/li/controller/LicenseController.java b/jetbra-server/src/main/java/win/novice/li/controller/LicenseController.java
index 022f188..af874d9 100644
--- a/jetbra-server/src/main/java/win/novice/li/controller/LicenseController.java
+++ b/jetbra-server/src/main/java/win/novice/li/controller/LicenseController.java
@@ -13,14 +13,12 @@ import org.springframework.web.bind.annotation.RequestBody;
 import org.springframework.web.bind.annotation.RestController;
 import win.novice.li.model.License;
 
-import java.io.FileInputStream;
 import java.io.InputStreamReader;
 import java.nio.charset.StandardCharsets;
 import java.security.*;
 import java.security.cert.CertificateFactory;
 import java.security.cert.X509Certificate;
 import java.util.Base64;
-import java.util.HashMap;
 import java.util.Map;
 
 @RestController
@@ -33,8 +31,6 @@ public class LicenseController {
     @PostMapping("/generateLicense")
     @SneakyThrows
     public Map<String, Object> generateLicense(@RequestBody @Validated License license) {
-        Map<String, Object> ans = new HashMap<>();
-
         String licenseId = generateLicenseId();
         license.setLicenseId(licenseId);
 
@@ -42,7 +38,6 @@ public class LicenseController {
         byte[] licensePartBytes = licensePart.getBytes(StandardCharsets.UTF_8);
         String licensePartBase64 = Base64.getEncoder().encodeToString(licensePartBytes);
 
-
         Signature signature = Signature.getInstance("SHA1withRSA");
         signature.initSign(PRIVATE_KEY);
         signature.update(licensePartBytes);
@@ -51,8 +46,7 @@ public class LicenseController {
 
         String result = licenseId + "-" + licensePartBase64 + "-" + sigResultsBase64 + "-" + Base64.getEncoder().encodeToString(CRT.getEncoded());
 
-        ans.put("license",result);
-        return ans;
+        return Map.of("license", result);
     }