[Unattended] OpenVPN server and client on same machine

[Nagilum <Nag...@gm...>]

Hi,
 
when I tried to install an openvpn-tunnel used by openvpn-gui I saw, that on
this machine (it's not mine) already is an OpenVPN-Tunnel installed.
The already existing is a server and my tun should be a client.
I've got the error message, that openvpn can't open the local port 1194. (I
think because it's used by the server)
Someone told me, that I have to change the port and everything should be
fine,
so I've changed my VPN to port 1190, but I get the same error message.
 
Isn't it possible to use one machine (Windows XP Pro SP3) as a server and a
client at the same time?
Any solutions for that mess?
Else, where could my problem be?
 
The FAQs didn't help me and searching the mailing list isn't easy, I don't
know which syntax I have to search for.
(client and server isn't very helpfull)
 
Regards
 - Christof