Just in case anyone will ever need this:
[root@plesk ~]# rpm -ivh epel-release-6-8.noarch.rpm
[root@plesk ~]# yum install vpnc
[root@plesk vpnc]# perl /usr/share/doc/vpnc-0.5.3/pcf2vpnc YourWindowsConfig.pcf your.conf
[root@plesk vpnc]# vpnc /etc/vpnc/your.conf
Enter password for user@xxx.xxx.xxx.xxx:
vpnc: server requested domain, but none set (use “Domain …” in config or --domain
[root@plesk vpnc]# vpnc /etc/vpnc/your.conf --domain “”
Enter password for user@xxx.xxx.xxx.xxx:
