Apr 20, 2020 · Troubleshooting ISAKMP – Phase 1 PreShared Key. As you already know, the Global VPN Client, establish an IPSec tunnel with the SonicWall Firewall. In the IPSec tunnel, we have two different phases i.e. Phase 1 & Phase 2. A PreShared key is used during the phase 1 parameter negotiation.

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Phase 2 Parameters. IKE Phase 2 negotiates an IPSec tunnel by creating keying material for the IPSec tunnel to use (either by using the IKE phase 1 keys as a base or by performing a new key exchange). The IKE Phase 2 parameters supported by NSX Edge are: Triple DES, AES-128, AES-256, and AES-GCM [Matches the Phase 1 setting]. SHA1, SHA_256.

Troubleshooting IKE Phase 1 problems is best handled by reviewing VPN status messages on the responder firewall.The responder is the "receiver" side of the VPN that is receiving the tunnel setup requests.

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It would be helpful if we can use a common vpn template and exchange the Phase-1 and Phase-2 SA (security associations) information between both parties before setting up the vpn tunnel. Phase 1 (ISAKMP) security associations fail. The first step to take when Phase-1 of the tunnel not comes up. Configure IPSec VPN Phase 1 Settings. When an IPSec connection is established, Phase 1 is when the two VPN peers make a secure, authenticated channel they can use to communicate. This is known as the ISAKMP Security Association (SA). Fireware supports two versions of the Internet Key Exchange protocol, IKEv1 and IKEv2. Please make sure that in the Phase-1 Settings section, the local ID type and remote ID type are both specified as NAME, and in the Phase-2 Settings section, the proposal is not specified as ah-md5 or ah-sha1. Otherwise, the VPN tunnel may fail to be established. Figure 3-6 Verifying the phase-1 configuration. Figure 3-7 Verifying the phase-2