Instructions
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The ExpressionEngine 2.0 version is available by switching to the 2.X branch. 

You’ll need an install of Vanilla Forums 2 with the SSO plugin before we go any further. On the SSO settings page fill in the text fields so it looks similar:

# Authenticate Url
http://example.com/ee/index.php/sso/vanilla

# Registration Url
http://example.com/ee/index.php/member/register

# Sign-in Url
http://example.com/ee/index.php/member/login

# Sign-out Url
http://example.com/ee/index.php?ACT=10

In the Vanilla Forums config.php make sure the following cookie name is set:
$Configuration['Garden']['Cookie']['Name'] = 'exp_vanilla';

Now you’ve (hopefully) got that sorted move the “ext.sm_vanilla.php” extension file into your “/system/extensions/” folder. You can enable that in the control panel now.

Create a template matching the one used for “Authenticate Url” with the following inside:
{if logged_in}
UniqueID={member_id}
Name={username}
Email={email}
{/if}


Extra
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You will almost certainly want to have your EE admin account act as the Vanilla admin so you will need to make sure that in the Vanilla DB there is a row in “GDN_UserAuthentication” that matches up your admin accounts (usually both have the ID of 1).


Finally
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Clear all of your cookies and I think that should be it. You can now log in to you Vanilla installation using EE. I’m sorry it’s not easier but there is nothing I can do on the EE side.