connected party did not respond

Warning: mysqli_connect(): (HY000/2002): A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond. in D:\xamp\htdocs\practice\sign.php on line 3

I don’t know what you’re trying to do if you only post an error message without context, but I can tell you that remote MySQL access is not possible on free hosting. You can only access your database from PHP code running on your account here, and from our phpMyAdmin installation. You cannot access the database from PHP code on your own computer.