2. Configure the Extranet Web Application
Your extranet web application settings in Central Administration now need to be configured to take advantage of the work just completed by the Setup Wizard. Follow these instructions to complete this step:
- Navigate to the Manage Web Applications page in Central Administration and select your extranet web application and then click on Authentication Providers in the ribbon:

- Select the "Default Zone" from the list of zones:
Tip: SharePoint 2019, 2016, 2013 and 2010 support "multi-mode" authentication for a web application. This means that you can enable multiple authentication providers on a single web application. In your case, you will want both Windows Authentication and Forms-based Authentication enabled on your extranet web application. Internal users (employees) will use Windows Authentication and external users (non-employees) will use forms-based authentication. This is possible to do, using the same URL, because of SharePoint's support for multi-mode authentication.

- This step is optional, but recommended. The name for the setting, "Enable anonymous access" is misleading. If you check the box, you are not enabling your web application to be accessed anonymously. Instead, you are allowing Anonymous Access settings to be configured later, if necessary, on one or more objects in a given SharePoint site. In some SharePoint farms, it is necessary to enable Anonymous Access on certain objects in the root site collection in order for ExCM's self-service password reset pages to work properly. If this turns out to be the case in your farm, if the web application-level setting below is already enabled, it will take less time and be less disruptive to your users, if you later determine that objects in the root site collection need Anonymous Access enabled for them. (Note: Read this article to understand why this is necessary and why it is not a security risk):

- Enable "Forms-based Authentication" and fill in the names you chose in the Setup Wizard for the ASP.NET Membership Provider and Role Manager:

- Configure the web application to use the custom Sign In page that is provided with ExCM (located at /_layouts/SPSolutions/ExCM/Signin.aspx):

- Click Save to save the settings.
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Note: Saving the web application's authentication settings can take several minutes, and you may not see anything happening immediately when you click Save. SharePoint is doing a lot of work in the background. Be patient.
- Now you are ready to proceed with the next step: 3. Add Extranet Account Managers.
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