IIS Configuration :: Membership Forms Remember Me Is Not Retained When Hosted On Shared Hosting

Why remember me doesn't work? As you can see in picture below Expire date is at the end of session although I set expiration to 1 month. This is my login button codes

protected void btn_login_Click(object sender, EventArgs e) {
if (!Page.User.Identity.IsAuthenticated) {
if (GetMemberAuthenticate(txt_uname.Text, FormsAuthentication.HashPasswordForStoringInConfigFile(txt_pass.Text, "MD5")))

[Code] ....

And this is in global.asax

And in web.config

<authentication mode="Forms">
<forms loginUrl="Default.aspx" defaultUrl="~/" name="MyCookieName"
slidingExpiration="true"
timeout="43200"></forms>
</authentication>
 
[Code] ....