Help with Symantec VPN 100 Log Entry

Hi,

Can someone please explain the following log entries mean?

11/03/2006 09:29:23.05 EK - Initiating IKE Aggressive Mode 11/03/2006 09:29:23.35 EK - STATE_AGGR_I1: initiate 11/03/2006 09:29:24.65 EK - STATE_AGGR_I2 sent AI2, ISAKMP SA established 11/03/2006 09:29:24.65 EK - Doing Quick Mode with 82.40.238.90 "EK"

11/03/2006 09:29:24.65 EK - initiating Quick Mode

11/03/2006 09:29:25.00 EK - STATE_QUICK_I1: initiate 11/03/2006 09:29:26.30 EK - STATE_QUICK_I2 sent QI2, IPsec SA established

11/03/2006 10:28:24.30 EK - !!!: replacing stale ISAKMP SA

11/03/2006 10:28:24.30 EK - Initiating IKE Aggressive Mode 11/03/2006 10:28:24.60 EK - STATE_AGGR_I1: initiate 11/03/2006 10:28:25.95 EK - STATE_AGGR_I2 sent AI2, ISAKMP SA established 11/03/2006 10:29:25.95 EK - !!!: ISAKMP SA expired (superseded by #3)

I understand that the entries up to 09:29 suggest the tunnel has been created, but it's the messages after this I don't understand.

Cheers, Bob