Not sure if anybody will have any suggestions for this but for max points, maybe someone will...
Here is the setup:
VPN Server: Win2k server (SP4), RRAS, ISA Server 2k Standard (SP2), RainConnect load balancing 2 broadband ISP links.
Clients: Win XP Pro (SP1) connecting from various home cable/DSL setups. ICS firewall disabled. They use built in Microsoft VPN client. Main functionality is Outlook-Exchange connection.
Problem frequency: Intermittently- some days worse than others
Problem: The clients can always work for a while (lets say 10 minutes). At some point, the clients will still appear in RRAS clients MMC with a status of "connected". Their connection time will still be ticking but I cannot ping them from the LAN. They obviously cannot perform any network related tasks as they can't see the network anymore. They will then disconnect/reconnect the VPN and as soon as they reconnect I can ping them and they are up and running. The process will then repeat itself...
This issue was not always here and I am trying to figure out what has caused it. The event log doesn't display anything relevant.