Why doesn't routing via openvpn work on ubuntu vps with ISPmanager lite?

Question

openvpn

There is a vps server with ubuntu and IspManager lite panel. Installed OpenVPN.
Through win7 connects to the server, I can work with server resources through OpenVPN.
But I can not enter the Internet, the sites do not open.
What I did to enable this feature:

#Определяем наш OpenVPN сервер в качестве шлюза по умолчанию
push "redirect-gateway" 
#Разрешаем соединения между клиентами
client-to-client
#добавляем маршруты
route 192.168.100.0 255.255.255.0
#Указываем DNS сервер
push "dhcp-option DNS 8.8.8.8"
push "dhcp-option DNS 8.8.4.4"

Win7 client settings

client
 dev tun
 proto tcp
 remote *.*.*.21 1194 
 resolv-retry infinite
 nobind
 persist-key
 persist-tun 
ca E:/*/ca.crt
cert E:/*/s.crt
key E:/*/s.key
ns-cert-type server
 auth SHA1
 comp-lzo
 verb 3

Executed the command:
echo 1 > /proc/sys/net/ipv4/ip_forward
Entered in /etc/rc.local:

iptables -t nat -A POSTROUTING -s 192.168.100.0/24 -o eth0 -j MASQUERADE

Ping or tracert to ya.ru (for example) shows which ip we are connecting to, but then a timeout.
What to look at and fix so that you can surf the Internet through openvpn?