diff --git a/Server/src/ServerManager/ServerManager.cpp b/Server/src/ServerManager/ServerManager.cpp
index ae139cb..f9e5fc4 100644
--- a/Server/src/ServerManager/ServerManager.cpp
+++ b/Server/src/ServerManager/ServerManager.cpp
@@ -177,22 +177,36 @@ void ServerManager::processLoginRequestPacket(LoginRequestPacket loginRequestPac
     std::string userName(
         (char*)loginRequestPacket.__data.data,
         loginRequestPacket.__data.packetLength);
-    registerUser(userName, data->socket);
+    if (registerUser(userName, data->socket)) {
+        LoginResponsePacket loginResponsePacket;
+        loginResponsePacket.__data.packetType = Chattr::PacketCategory::PACKET_RESPONSE;
+        loginResponsePacket.__data.requestType = Chattr::RequestType::LOGIN;
+        loginResponsePacket.__data.dataType = Chattr::DataType::BINARY;
+        loginResponsePacket.__data.packetLength = sizeof(Chattr::ResponseStatusCode) + sizeof(Snowflake);
+        loginResponsePacket.__data.responseStatusCode = Chattr::ResponseStatusCode::RES_OK;
+        Snowflake yourId = userSocket2UID_[data->socket];
+        ::memcpy(loginResponsePacket.__data.yourId, &yourId, sizeof(Snowflake));
 
-    LoginResponsePacket loginResponsePacket;
-    loginResponsePacket.__data.packetType = Chattr::PacketCategory::PACKET_RESPONSE;
-    loginResponsePacket.__data.requestType = Chattr::RequestType::LOGIN;
-    loginResponsePacket.__data.dataType = Chattr::DataType::BINARY;
-    loginResponsePacket.__data.packetLength = sizeof(Chattr::ResponseStatusCode) + sizeof(Snowflake);
-    loginResponsePacket.__data.responseStatusCode = Chattr::ResponseStatusCode::RES_OK;
-    Snowflake yourId = userSocket2UID_[data->socket];
-    ::memcpy(loginResponsePacket.__data.yourId, &yourId, sizeof(Snowflake));
+        loginResponsePacket.convToN();
+        memcpy(data->wsabuf.buf, loginResponsePacket.serialized, 18);
+        data->sendbytes = 18;
+        data->wsabuf.len = 18;
+        data->IOCPInstance->send(data, 1, 0);
+    }
+    else {
+        LoginResponsePacket loginResponsePacket;
+        loginResponsePacket.__data.packetType = Chattr::PacketCategory::PACKET_RESPONSE;
+        loginResponsePacket.__data.requestType = Chattr::RequestType::LOGIN;
+        loginResponsePacket.__data.dataType = Chattr::DataType::BINARY;
+        loginResponsePacket.__data.packetLength = sizeof(Chattr::ResponseStatusCode);
+        loginResponsePacket.__data.responseStatusCode = Chattr::ResponseStatusCode::BAD_REQUEST;
 
-    loginResponsePacket.convToN();
-    memcpy(data->wsabuf.buf, loginResponsePacket.serialized, 18);
-    data->sendbytes = 18;
-    data->wsabuf.len = 18;
-    data->IOCPInstance->send(data, 1, 0);
+        loginResponsePacket.convToN();
+        memcpy(data->wsabuf.buf, loginResponsePacket.serialized, 10);
+        data->sendbytes = 10;
+        data->wsabuf.len = 10;
+        data->IOCPInstance->send(data, 1, 0);
+    }
 }
 
 void ServerManager::processRoomCreateRequestPacket(RoomCreateRequestPacket roomCreateRequestPacket, Chattr::IOCPPASSINDATA* data) {
@@ -428,6 +442,7 @@ bool ServerManager::registerUser(std::string userName, std::shared_ptr<TCPSocket
     userName2ID_[userName] = UID;
     UID2userSocket_[UID] = sock;
     userSocket2UID_[sock] = UID;
+    return true;
 }
 
 void ServerManager::deleteUser(Snowflake UID) {