We have several VPN Clients which connects to a 6509 SUP720-3B with VPN-SPA.
They all show the same symptoms. They may run for 24 hours but they very often disconnects after nearly 50 min. or sometimes 100 min.
In the log of the 6500 there can be seen a difference already in the first message received by the 6500 from the VPN client:
No disconnect->log entry 6500:
May 26 11:15:45.371 UTC: ISAKMP (68356): received packet from 10.110.192.4 dport 500 sport 4236 Global (R) QM_IDLE
Disconnect->log entry 6500:
May 27 10:37:16.160 UTC: ISAKMP (0): received packet from 10.110.192.4 dport 500 sport 1774 Global (N) NEW SA
May 27 10:37:16.160 UTC: %CRYPTO-4-IKMP_NO_SA: IKE message from 10.110.192.4 has no SA and is not an initialization offer
VPN Client v 5.0040300
- SUP720-3B IOS:sup-bootdisk:s72033-advipservicesk9_wan-mz.122-33.SXI.bin
- VPN SPA: 7600-SSC-400