I guess you enabled the firewall. You will have to change the bastille configuration script to make it compatible with vp servers.
In virtouzzo servers, the network cards are named "venet0" and not eth0. To configure the firewall, edit the files:
change the line:
PUBLIC_IFACES="eth+ ppp+ slip+"
PUBLIC_IFACES="eth+ ppp+ slip+ venet+"
Then restart your vps. If your vps is not virtouzzo you will have to check with the command "ifconfig" what the name of your network interface is.