Connecting to Windows Server 2008 VPN from Android Phone

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http://serverfault.com – I have used my mobile phone to connect to other vpn's using PPTP and it has worked. I recently setup my own VPN on Windows Server 2008, it is working for Windows Clients, but when I connect with my phone I get the error message "The connection was prevented because of a policy configured on your RAS/VPN server. Specifically, the authentication method used by the server to verify your username and password may not match the authentication method configured in your connection profile. Please contact the Administrator of the RAS server and notify them of this error." I am a noob to Windows Se (HowTos)