Method Not Allowed

The requested method GET is not allowed for the URL /admin/index.html.

/index.html (Public root / auth form)
/admin/index.html (The contents of the folder i wish to protect)

<form method="POST" action="/admin">
    User: <input type="text" name="httpd_username" value="" />
    Pass: <input type="password" name="httpd_password" value="" />
    <input type="submit" name="login" value="Login" />
</form>

<VirtualHost *:80>
    ServerAdmin webmaster@mydomain.com
    ServerName mydomain.com
    ServerAlias admin.mydomain.com

    DocumentRoot /var/www/mydomain.com/admin/

    <Directory /var/www/mydomain.com/admin/>
        <LimitExcept GET POST>
             Require all denied
        </LimitExcept>
        Options -ExecCGI -FollowSymLinks -Includes -Indexes -MultiViews
        Require all granted
    </Directory>

    <Location /admin>
        SetHandler form-login-handler
        AuthFormLoginRequiredLocation http://admin.mydomain.com/index.html
        AuthFormLoginSuccessLocation http://admin.mydomain.com/admin/index.html
        AuthFormProvider file
        AuthUserFile /var/www/mydomain.com/admin_inc/.htpasswd
        AuthType form
        AuthName realm
        Session On
        SessionCookieName session path=/private;domain=admin.mydomain.com;httponly;secure;
        SessionCryptoPassphrase secret
    </Location>

</VirtualHost>

[Mon May 19 10:26:38.xxxxxx 2014] [auth_form:error] [pid xxxxx] [client xxxxxx:xxxxx] AH01811: the form-login-handler only supports the POST method for /admin/index.html, referer: http://admin.mydomain.com/

<VirtualHost *:80>
    ServerAdmin webmaster@example.com
    ServerName example.com
    ServerAlias www.example.com

    DocumentRoot /var/www/example.com/

    <Location /admin>
        # Protect all resources under /admin with form auth. Note that the login form is NOT under /admin : not sure this is required, but this is how I got it working
        AuthFormLoginRequiredLocation http://www.example.com/index.html
        AuthFormLoginSuccessLocation http://www.example.com/admin/index.html
        AuthFormProvider file
        AuthUserFile /var/www/example.com/.htpasswd
        AuthType form
        AuthName realm
        Session On
        SessionCookieName session path=/private;domain=www.example.com;httponly;secure;
        SessionCryptoPassphrase secret
    </Location>
    <Location /admin/dologin>
        # Since this location is a sub-path of the previous one, it inherits all parameters above
        # It will be the only URL to be able to process form logins, and the only one to require POST
        SetHandler form-login-handler
    </Location>

</VirtualHost>

<form method="POST" action="/admin/dologin">
    User: <input type="text" name="httpd_username" value="" />
    Pass: <input type="password" name="httpd_password" value="" />
    <input type="submit" name="login" value="Login" />
</form>