Hi
Please have a look at this :-
Link:- https://helpx.adobe.com/experience-manager/using/secure_sites.html
// Building Secure Adobe Experience Manager Web Sites
[img]https://helpx.adobe.com/experience-manager/using/secure_sites/_jcr_content/main-pars/image_3.img.png...
AEM form-based authentication displays a login form (as shown in the previous illustration). When the user fills in the login form and submits the data, AEM stores the successful authentication in a Cookie or an HTTP Session. If the authentication is unsuccessful, then an error message is displayed.
By default, the URL of a form submission has to end with /j_security_check. That is, a login Form Action can POST to <anything>/j_security_check. For example:
<form action="${homePage.path}/j_security_check
The user name and password names must be j_username and j_password. For example:
<div class="form-group">
<label for="j_username">Username</label> <input type="text"
name="j_username">
</div>
<div class="form-group">
<label for="j_password">Password</label> <input type="password"
name="j_password">
</div>
Option 2 :- Check the networks calls in browser console wile logging in, and try to submit the parameters of form accordingly.
~kautuk
Kautuk Sahni