Hmm - I fought with an issue last night on 6.0R3.1 that might be related, also caused a fail to connect, fail to reconnect issue within a few seconds. We were using split tunneling, and one of the networks I identified to tunnel via the VPN (10.6.8/24) was an exact match for the network and mask of the NC IP address provided from a local pool on the IVE - I found an error adding the routes deep in the NC logs. I modified the split tunneling routes to use a supernet that didn't exactly match (eg 10.0.0.0/8) and it all started working fine. Clients were both Vista.
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