After investigations, commit the proposed patch by kklimonda presented with the following introduction : cm/templates/site/login_form.html template uses a relative url for the form action, which seems to break deployment in the subfolder when trailing slash is missing (the form redirects to the upper folder breaking login). Using {% url login %} (as in the attached patch) instead would fix the issue.

     1

{% extends "site/layout/base.html" %}

     2

{% load i18n %}

     3

{% block content %}

     4

<h1>500: {% blocktrans %}Server Error{% endblocktrans %}</h1>

     5

     6

{% blocktrans %}An error has occurred.{% endblocktrans %}

     7

{% endblock %}