after "cat" log now says: response was invalid[2]: (ISAKMP_N_INVALID_PAYLOAD_TYPE)(1) Other issue/idea: FRITZBox only accepts "aggressive" as mode in phase 1 - does not load vpn config when I change this to "main" To get vpnc running on Android device connecting to FRITZBox as vpn server the value in vpnc "nat-t-ike-02" (cd60464335df21f87cfdb2fc68b6a448 in binary) had to be changed to "nat-t-ike-03" (binary: 7d9419a65310ca6f2c179d9215529d56) by patching the vpnc binary
const unsigned char VID_NATT_02[] = { /* "draft-ietf-ipsec-nat-t-ike-02" */ 0xcd, 0x60, 0x46, 0x43, 0x35, 0xdf, 0x21, 0xf8, 0x7c, 0xfd, 0xb2, 0xfc, 0x68, 0xb6, 0xa4, 0x48 };
IPSec gateway %s IPSec ID %s IPSec secret %s IKE AuthMode psk IKE DH Group dh2 Xauth username %s Xauth password %s Domain %s
Hope this helps to help me (and all N9 FRITZBox users that need VPN) Thanks again