ZyXEL Communications ZyWALL 110 Handbook & Instructions page 97

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If you see that Phase 1 IKE SA process done but still get below [info] log message,
please check ZyWALL/USG Phase 2 Settings. Both ZyWALL/USG at the HQ and
Branch sites must use the same Protocol, Encapsulation, Encryption, Authentication
method and PFS to establish the IKE SA.
Figure 159 MONITOR > Log
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Make sure the both ZyWALL/USG at the HQ and Branch sites security policies allow
IPSec VPN traffic. IKE uses UDP port 500, AH uses IP protocol 51, and ESP uses IP
protocol 50.
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Default NAT traversal is enable on ZyWALL/USG, please make sure the remote
IPSec device must also have NAT traversal enabled.
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