Netscreen 5GT vs. Symantec Enterprise Firewall 7.04

Hi there...

Having problems with connecting a Netscreen 5GT to a SEF (Symantec Enterprise Firewall).

Phase 1 is going correctly (either main or aggressive mode), but Phase 2 gives an error IKE: Received a notification message for DOI

SYN Flood is disabled at both sides...

Local site (Netscreen 5GT):

192.168.75.0/24 (Private) and 80.127.xxx.xxx/32 public Tunnel and policy (bi-directional created for full access) created

Remote site (SEF 7.04):

192.6.181.0/24 (private) and 194.151.xxx.xxx/32 public

Please help

Please HELP........