diff --git a/script/driver/mysql.lua b/script/driver/mysql.lua
index efd3329f..f2123314 100644
--- a/script/driver/mysql.lua
+++ b/script/driver/mysql.lua
@@ -116,7 +116,6 @@ function MysqlDB:check_alive()
         thread_mgr:entry(self:address(), function()
             local channel = makechan("check mysql")
             for _, sock in pairs(self.connections) do
-                sock:close()
                 channel:push(function()
                     return self:login(sock)
                 end)
@@ -137,6 +136,7 @@ function MysqlDB:login(socket)
     end
     local ok, res = self:auth(socket)
     if not ok then
+        socket:close()
         self:delive(socket)
         log_err("[MysqlDB][login] auth db(%s:%s:%s) auth failed! because: %s", ip, port, id, res)
         return false