The build in VPN client for PPTP in Windows XP, 2003, Vista, 7 and 2008 allows single sign-on with the Windows user credentials even if the client doesn't have a current NTLM or Kerberos ticket. It is using the user name and cached password from the local login process within Windows.
This works fine with Astaro, but I like to change to another VPN solution as PPTP with using TCP and GRE combined often causes problems via NAT on public networks or cheap home routers.
Is any other VPN solution known which works with Astaro and offers SSO? Maybe smart card solutions with Cisco-Client where the PIN can be disabled?
Added 12:47PM:
With SSO I mean passwordless SSO, so the user does not need to enter any authentication information after he started his Windows system.
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