[longname]

Thanks for your reply.
Base on this configuration, we work fine for nearly one year. But don't know what reason, it has problem only with VPN and OWA. All inside connection (Our firewall like a big router ) are ok.

For Nokia configuration:
1. heartbeat line configure as primary cluster line. Heatbeat line connect through a small hub which only connect two nokia IP530.
2. We have a small network which connect two nokia and managment server. But for this network, not configure with cluster IP.