diff --git a/lualib/skynet/socketchannel.lua b/lualib/skynet/socketchannel.lua
index 521d98325..3054de43f 100644
--- a/lualib/skynet/socketchannel.lua
+++ b/lualib/skynet/socketchannel.lua
@@ -388,13 +388,17 @@ end
 
 local function check_connection(self)
 	if self.__sock then
+		local authco = self.__authcoroutine
 		if socket.disconnected(self.__sock[1]) then
 			-- closed by peer
 			skynet.error("socket: disconnect detected ", self.__host, self.__port)
 			close_channel_socket(self)
+			if authco and authco == coroutine.running() then
+				-- disconnected during auth, See #1513
+				return false
+			end
 			return
 		end
-		local authco = self.__authcoroutine
 		if not authco then
 			return true
 		end