Dari log
May 28 03:01:41 ubuntu-ipsec charon: 05[ENC] parsed IKE_AUTH request 2 [ EAP/RES/ID ]
May 28 03:01:41 ubuntu-ipsec charon: 05[IKE] received EAP identity ‘jaranguda’
May 28 03:01:41 ubuntu-ipsec charon: 05[IKE] loading EAP_MSCHAPV2 method failed
May 28 03:01:41 ubuntu-ipsec charon: 05[IKE] received EAP identity ‘jaranguda’
May 28 03:01:41 ubuntu-ipsec charon: 05[IKE] loading EAP_MSCHAPV2 method failed
solusinya
# Debian/Ubuntu apt install libcharon-standard-plugins