[Piotr M.]

The secure login page is located at example.com/xcart/secure_login.php
But pay attention to the fact this page will take you to login page over https.
If you need login page with over http, add

PHP Code:

define('HTTPS_CHECK_SKIP',1); 


at the beginning of secure_login.php before line

PHP Code:

include "./auth.php"; 


And modify /skin1/customer/main/secure_login_form.tpl
Replace

<form action="{$https_location}/include/login.php" method="post" name=secureform>

with

<form action="{$http_location}/include/login.php" method="post" name=secureform>

But that's quick dirty trick. The first way with secure login is better than this.
One more way is creating separate page for insecure login, if you need one.