diff --git a/shadowsocks/tcprelay.py b/shadowsocks/tcprelay.py
index e70de02..968e4d1 100644
--- a/shadowsocks/tcprelay.py
+++ b/shadowsocks/tcprelay.py
@@ -26,6 +26,7 @@ import logging
 import binascii
 import traceback
 import random
+import platform
 
 from shadowsocks import encrypt, obfs, eventloop, shell, common
 from shadowsocks.common import pre_parse_header, parse_header
@@ -564,9 +565,10 @@ class TCPRelayHandler(object):
         else:
             remote_sock.setsockopt(socket.SOL_TCP, socket.TCP_NODELAY, 1)
             remote_sock.setsockopt(socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1)
-            remote_sock.setsockopt(socket.SOL_TCP, socket.TCP_KEEPIDLE, 120)
-            remote_sock.setsockopt(socket.SOL_TCP, socket.TCP_KEEPINTVL, 20)
-            remote_sock.setsockopt(socket.SOL_TCP, socket.TCP_KEEPCNT, 5)
+            if platform.system() != 'Windows':
+                remote_sock.setsockopt(socket.SOL_TCP, socket.TCP_KEEPIDLE, 120)
+                remote_sock.setsockopt(socket.SOL_TCP, socket.TCP_KEEPINTVL, 20)
+                remote_sock.setsockopt(socket.SOL_TCP, socket.TCP_KEEPCNT, 5)
 
             if not self._is_local:
                 bind_addr = ''