I have been facing ipsec vpn tunnel issue on upgrading my pix 535 from 6.3(5) to 7x .I am having 20 odd site to site vpn tunnels configured on my pix. Problem is that all of sudden data stops transferring through tunnel. If I check the status of ipsec vpn tunnel by
sh crypto isakmp sa
sh crypto ipsec sa
sh crypto isakmp detail
,it shows me up and connected. Cisco recommended to check with ASA.I got ASA 5520 installed with ver 7.2(2). I observed same problem 3 times in 1 week. Has anybody else observed same issue. Need solution.
Thanks in advance