I have IPSEC configured between local end -Cisco PIX 515E & Remote end device - Nortel VPN box . Users from Local end use VPN
to access Remote end applciations. But I am facing issues like VPN disconnections ( 10 users out of 30) intermittently. After i perform clear all the sessions from Cisco PIX firewall users who are facing problem are able to connect back to the VPN with out any issues.
My Network :-
user PC ----> Coreswitch--> Netscreen Internal Firewall ----> Cisco PIX External firewall 6.2OS ver----> ISP Provider -------> Remote end Nortel VPN.
When we checked with our vendor Cisco theya re suggesting us to enable NAT-T between our Internal Firewall & Remote VPN to overcome this issue.
Please let us know do we need this option to enable. Also let me know other possibilities for causing this issue.
Thanks and Regards,