diff --git a/lualib/socketchannel.lua b/lualib/socketchannel.lua
index c2886e31..62818613 100644
--- a/lualib/socketchannel.lua
+++ b/lualib/socketchannel.lua
@@ -161,9 +161,7 @@ local function connect_backup(self)
 				host, port = addr.host, addr.port
 			else
 				host = addr
-				if not addr:find(":", 1, true) then
-					port = self.__port
-				end
+				port = self.__port
 			end
 			skynet.error("socket: connect to backup host", host, port)
 			local fd = socket.open(host, port)
@@ -198,6 +196,7 @@ local function connect_once(self)
 		if not ok then
 			close_channel_socket(self)
 			if message ~= socket_error then
+				self.__authcoroutine = false
 				skynet.error("socket: auth failed", message)
 			end
 		end