Contrary to <ahref="../../documentation/2.0/authmulti.html"class="wikilink1"title="documentation:2.0:authmulti">multiple backend stacking</a>, backend choice will present all available authentication methods to users, who will choose the one they want.
In Manager, go in <code>General Parameters</code>><code>Authentication modules</code> and choose Choice for authentication.
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<p><divclass="noteimportant">When <code>Choice</code> is selected for authentication, values for Users and Password modules are not used anymore. Also, all backends parameters are displayed.
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Then, go in <code>Choice Parameters</code>:
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<liclass="level1"><divclass="li"><strong><acronymtitle="Uniform Resource Locator">URL</acronym> parameter</strong>: parameter name used to set choice value (default: <code>lmAuth</code>)</div>
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<liclass="level1"><divclass="li"><strong>Allowed modules</strong>: click on <code>New choice</code> to add a choice.</div>
<liclass="level1"><divclass="li"><strong><acronymtitle="Uniform Resource Locator">URL</acronym></strong>: optional, can be used to redirect on another <acronymtitle="Uniform Resource Locator">URL</acronym> (for example <ahref="https://authssl.example.com"class="urlextern"title="https://authssl.example.com"rel="nofollow">https://authssl.example.com</a>). This is mandatory if you want to use an Apache authentication module, which is run by Apache before showing the LemonLDAP::NG portal page.</div>