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You have set up the secret URL parameter. You need to use it when accessing your site's backend. For example, if your site is https://www.example.com and you have set up the secret URL parameter foobar you need to access your site's administrator login page as https://www.example.com/administrator/index.php?foobar.

After you do this once from a specific browser, a cookie is set to “remember” that you know the secret URL parameter. This cookie persists until you clear cookies in your browser, manually log out of your site's administrator (as opposed to letting the session expire after a while), or if one of the following changes: your site's URL, your site's secret, or the identification of your browser. When the cookie is set, you can access your site without the secret URL parameter, in our example https://www.example.com/administrator, without getting blocked. That's why you have no problem on your main computer.