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Go to Authentication section, enter Pre-shared Key and choose negotiation Mode
the same as the peer ZyWALL/USG’s.
VPN > IPsec > Wizard > Custom VPN Tunnel (No Template) > Authentication
Configure Phase 1 Proposal and Diffie-Hellman Group as the peer ZyWALL/USG
Advanced Settings’ Phase 1 Settings > Proposal and Key Group.
VPN > IPsec > Wizard > Custom VPN Tunnel (No Template) > Phase 1 Proposal