@hugolia:
Is it possible to have User/password for some users but not for all?
I am using OpenVPN for RoadWarriors users (mostly notebooks). But now I need to setup a connection to a site where I will have a server with a daemon client to establish the VPN between sites.
Yes, but they would need to use separate server instances. You can have one server that does user/pass, one that does not, and others for site-to-site VPNs.
Any more detail than that belongs in its own thread specific to your implementation, though, so if you need more help than that, feel free to start a fresh thread and ask.