ExhibitYou are trying to configure an IPsec tunnel between SRX Series devices in the corporate...

According to the Juniper documentation, the local identity for an IPsec VPN tunnel must match the remote identity of the peer device. The local identity can be configured as an IP address, a hostname, a distinguished name, or an advpn identifier. The advpn identifier is used for dynamic VPNs that support multiple remote endpoints. In the exhibit, the corporate device has the local identity configured as inet advpn, which means it expects the branch1 device to have the same remote identity. However, the branch1 device has the local identity configured as inet, which does not match the corporate device’s remote identity. Therefore, the IKE negotiation fails and the IPsec tunnel is not established. To solve this problem, the local identity on the branch1 device should be changed to inet advpn, so that it matches the corporate device’s remote identity. References: [Configuring an IKE Gateway] 1, [Configuring Local and Remote Identities] 2

1: https://www.juniper.net/documentation/us/en/software/junos/vpn-ipsec/topics/task/configuration/security-ike-gateway-configuring.html  2: https://www.juniper.net/documentation/us/en/software/junos/vpn-ipsec/topics/topic-map/security-ipsec-vpn-identities.html