diff --git a/Server/src/config.json b/Server/src/config.json
index 5d7237d..9b55171 100644
--- a/Server/src/config.json
+++ b/Server/src/config.json
@@ -1,5 +1,5 @@
 {
-	"IP Version" : 6,
+	"IP Version" : 4,
 	"Listen Port" : 9010,
 	"LogLevel" : 1,
 	"LogfileCount" : 5,
diff --git a/Server/src/server.cpp b/Server/src/server.cpp
index b430caf..a73251e 100644
--- a/Server/src/server.cpp
+++ b/Server/src/server.cpp
@@ -32,6 +32,12 @@ int main() {
     sock.listen(SOMAXCONN);
     struct Chattr::TCPSocket clientSock;
     struct Chattr::Address clientAddr;
+
+    if (config.ipVersion == 4)
+        clientAddr.length = sizeof(sockaddr_in);
+    else
+        clientAddr.length = sizeof(sockaddr_in6);
+
     spdlog::info("Waiting for connection...");
     sock.accept(clientSock, clientAddr);
 }
\ No newline at end of file
diff --git a/impl/Socket/Log.cpp b/impl/Socket/Log.cpp
index a2b53ad..8b5f510 100644
--- a/impl/Socket/Log.cpp
+++ b/impl/Socket/Log.cpp
@@ -24,20 +24,20 @@ void setDefaultLogger(spdlog::level::level_enum logLevel, gsl::czstring logFileN
 
 void critical(gsl::czstring msg) {
 #ifdef _WIN32
-        gsl::zstring msgbuf = nullptr;
-        FormatMessageA(
-            FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
-            NULL,
-            WSAGetLastError(),
-            MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
-            msgbuf,
-            0,
-            NULL);
-        spdlog::critical("[{}] {}", msg, msgbuf);
-        LocalFree(msgbuf);
+    LPSTR msgbuf = nullptr;
+    FormatMessageA(
+        FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
+        NULL,
+        WSAGetLastError(),
+        MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
+        (LPSTR)&msgbuf,
+        0,
+        NULL);
+    spdlog::critical("[{}] {}", msg, msgbuf);
+    LocalFree(msgbuf);
 #elif __linux__
-        gsl::czstring msgbuf = strerror(errno);
-        spdlog::critical("[{}] {}", msg, msgbuf);
+    gsl::czstring msgbuf = strerror(errno);
+    spdlog::critical("[{}] {}", msg, msgbuf);
 #else
 #error "이 플랫폼은 지원되지 않습니다."
 #endif
@@ -46,20 +46,20 @@ void critical(gsl::czstring msg) {
 
 void error(gsl::czstring msg) {
 #ifdef _WIN32
-        gsl::zstring msgbuf = nullptr;
-        FormatMessageA(
-            FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
-            NULL,
-            WSAGetLastError(),
-            MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
-            msgbuf,
-            0,
-            NULL);
-        spdlog::critical("[{}] {}", msg, msgbuf);
-        LocalFree(msgbuf);
+    LPSTR msgbuf = nullptr;
+    FormatMessageA(
+        FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
+        NULL,
+        WSAGetLastError(),
+        MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
+        (LPSTR)&msgbuf,
+        0,
+        NULL);
+    spdlog::critical("[{}] {}", msg, msgbuf);
+    LocalFree(msgbuf);
 #elif __linux__
-        gsl::czstring msgbuf = strerror(errno);
-        spdlog::critical("[{}] {}", msg, msgbuf);
+    gsl::czstring msgbuf = strerror(errno);
+    spdlog::critical("[{}] {}", msg, msgbuf);
 #else
 #error "이 플랫폼은 지원되지 않습니다."
 #endif
diff --git a/impl/Socket/Socket.cpp b/impl/Socket/Socket.cpp
index 2a705b5..e199e42 100644
--- a/impl/Socket/Socket.cpp
+++ b/impl/Socket/Socket.cpp
@@ -4,6 +4,14 @@
 
 namespace Chattr {
 
+Socket::Socket() {
+#ifdef _WIN32
+    WSADATA wsa;
+    if (WSAStartup(MAKEWORD(2, 2), &wsa) != 0)
+        log::critical("WSAStartup()");
+#endif
+}
+
 Socket::Socket(int domain, int type, int protocol) {
 #ifdef _WIN32
 	WSADATA wsa;
@@ -68,11 +76,11 @@ void Socket::move(const SOCKET __sock) {
     valid_ = true;
 };
 
-void Socket::bind(const sockaddr *__addr) {
-    bind((struct sockaddr *)__addr, sizeof(*__addr));
+void Socket::bind(sockaddr *__addr) {
+    bind((struct sockaddr *)__addr, sizeof(sockaddr));
 }
 
-void Socket::bind(const sockaddr *__addr, socklen_t __len) {
+void Socket::bind(sockaddr *__addr, socklen_t __len) {
     bindAddr.length = __len;
     std::memcpy(&bindAddr, __addr, __len);
     int retVal = ::bind(sock_, __addr, __len);
@@ -80,19 +88,19 @@ void Socket::bind(const sockaddr *__addr, socklen_t __len) {
         log::critical("bind()");
 }
 
-void Socket::bind(const sockaddr_in *__addr) {
-    bind((struct sockaddr *)__addr, sizeof(*__addr));
+void Socket::bind(sockaddr_in *__addr) {
+    bind((struct sockaddr *)__addr, sizeof(sockaddr_in));
 }
 
-void Socket::bind(const sockaddr_in *__addr, socklen_t __len) {
+void Socket::bind(sockaddr_in *__addr, socklen_t __len) {
     bind((struct sockaddr *)__addr, __len);
 }
 
-void Socket::bind(const sockaddr_in6 *__addr) {
-    bind((struct sockaddr *)__addr, sizeof(*__addr));
+void Socket::bind(sockaddr_in6 *__addr) {
+    bind((struct sockaddr *)__addr, sizeof(sockaddr_in6));
 }
 
-void Socket::bind(const sockaddr_in6 *__addr, socklen_t __len) {
+void Socket::bind(sockaddr_in6 *__addr, socklen_t __len) {
     bind((struct sockaddr *)__addr, __len);
 }
 
diff --git a/impl/Socket/TCPSocket.cpp b/impl/Socket/TCPSocket.cpp
index 6789a28..8721a8c 100644
--- a/impl/Socket/TCPSocket.cpp
+++ b/impl/Socket/TCPSocket.cpp
@@ -5,10 +5,7 @@
 namespace Chattr {
 
 void TCPSocket::init(int domain) {
-    sock_ = ::socket(domain, SOCK_STREAM, 0);
-	if (sock_ == INVALID_SOCKET)
-		log::critical("socket()");
-    
+    init(domain, SOCK_STREAM, 0);
     valid_ = true;
 }
 
diff --git a/include/Socket/Socket.hpp b/include/Socket/Socket.hpp
index 34f70fc..4bb5370 100644
--- a/include/Socket/Socket.hpp
+++ b/include/Socket/Socket.hpp
@@ -6,7 +6,7 @@ namespace Chattr {
 
 class Socket {
 public:
-    Socket() {}
+    Socket();
     Socket(int domain, int type, int protocol);
     ~Socket();
 
@@ -15,21 +15,21 @@ public:
     operator SOCKET() const;
     void move(const SOCKET);
     
-    void bind(const sockaddr *__addr);
-    void bind(const sockaddr *__addr, socklen_t __len);
+    void bind(sockaddr *__addr);
+    void bind(sockaddr *__addr, socklen_t __len);
 
     //IPV4
-    void bind(const sockaddr_in *__addr);
-    void bind(const sockaddr_in *__addr, socklen_t __len);
+    void bind(sockaddr_in *__addr);
+    void bind(sockaddr_in *__addr, socklen_t __len);
 
     //IPV6
-    void bind(const sockaddr_in6 *__addr);
-    void bind(const sockaddr_in6 *__addr, socklen_t __len);
+    void bind(sockaddr_in6 *__addr);
+    void bind(sockaddr_in6 *__addr, socklen_t __len);
 
     Socket(const Socket&) = delete;
     Socket& operator=(const Socket&) = delete;
     
-    struct Address bindAddr;
+    struct Address bindAddr = {};
 protected:
     bool valid_ = false;
     SOCKET sock_ = INVALID_SOCKET;