StrongSwan log:
Nov 11 06:37:51 00[DMN] +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Nov 11 06:37:51 00[DMN] Starting IKE service (strongSwan 5.9.11, Android 13 - TP1A.220624.014.S908BXXS6CWI1/2023-10-01, SM-S908B - samsung/b0sxeea/samsung, Linux 5.10.136-android12-9-27100597-abS908BXXS6CWI1, aarch64, org.strongswan.android)
Nov 11 06:37:51 00[LIB] providers loaded by OpenSSL: default legacy
Nov 11 06:37:51 00[LIB] loaded plugins: androidbridge charon android-log socket-default openssl nonce pkcs1 pem x509 xcbc kdf revocation eap-identity eap-mschapv2 eap-md5 eap-gtc eap-tls
Nov 11 06:37:51 00[JOB] spawning 16 worker threads
Nov 11 06:37:51 07[IKE] initiating IKE_SA android[8] to 192.168.1.1
Nov 11 06:37:51 07[ENC] generating IKE_SA_INIT request 0 [ SA KE No N(NATD_S_IP) N(NATD_D_IP) N(FRAG_SUP) N(HASH_ALG) N(REDIR_SUP) ]
Nov 11 06:37:51 07[NET] sending packet: from 192.168.1.96[39304] to 192.168.1.1[500] (948 bytes)
Nov 11 06:37:53 10[IKE] retransmit 1 of request with message ID 0
Nov 11 06:37:53 10[NET] sending packet: from 192.168.1.96[39304] to 192.168.1.1[500] (948 bytes)
Nov 11 06:37:56 11[IKE] retransmit 2 of request with message ID 0
Nov 11 06:37:56 11[NET] sending packet: from 192.168.1.96[39304] to 192.168.1.1[500] (948 bytes)
Nov 11 06:38:01 12[IKE] retransmit 3 of request with message ID 0
Nov 11 06:38:01 12[NET] sending packet: from 192.168.1.96[39304] to 192.168.1.1[500] (948 bytes)
Nov 11 06:38:06 13[IKE] giving up after 3 retransmits
Nov 11 06:38:06 13[IKE] establishing IKE_SA failed, peer not responding
Nov 11 06:38:06 14[IKE] unable to terminate IKE_SA: ID 8 not found
Nov 11 06:37:51 00[DMN] +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Nov 11 06:37:51 00[DMN] Starting IKE service (strongSwan 5.9.11, Android 13 - TP1A.220624.014.S908BXXS6CWI1/2023-10-01, SM-S908B - samsung/b0sxeea/samsung, Linux 5.10.136-android12-9-27100597-abS908BXXS6CWI1, aarch64, org.strongswan.android)
Nov 11 06:37:51 00[LIB] providers loaded by OpenSSL: default legacy
Nov 11 06:37:51 00[LIB] loaded plugins: androidbridge charon android-log socket-default openssl nonce pkcs1 pem x509 xcbc kdf revocation eap-identity eap-mschapv2 eap-md5 eap-gtc eap-tls
Nov 11 06:37:51 00[JOB] spawning 16 worker threads
Nov 11 06:37:51 07[IKE] initiating IKE_SA android[8] to 192.168.1.1
Nov 11 06:37:51 07[ENC] generating IKE_SA_INIT request 0 [ SA KE No N(NATD_S_IP) N(NATD_D_IP) N(FRAG_SUP) N(HASH_ALG) N(REDIR_SUP) ]
Nov 11 06:37:51 07[NET] sending packet: from 192.168.1.96[39304] to 192.168.1.1[500] (948 bytes)
Nov 11 06:37:53 10[IKE] retransmit 1 of request with message ID 0
Nov 11 06:37:53 10[NET] sending packet: from 192.168.1.96[39304] to 192.168.1.1[500] (948 bytes)
Nov 11 06:37:56 11[IKE] retransmit 2 of request with message ID 0
Nov 11 06:37:56 11[NET] sending packet: from 192.168.1.96[39304] to 192.168.1.1[500] (948 bytes)
Nov 11 06:38:01 12[IKE] retransmit 3 of request with message ID 0
Nov 11 06:38:01 12[NET] sending packet: from 192.168.1.96[39304] to 192.168.1.1[500] (948 bytes)
Nov 11 06:38:06 13[IKE] giving up after 3 retransmits
Nov 11 06:38:06 13[IKE] establishing IKE_SA failed, peer not responding
Nov 11 06:38:06 14[IKE] unable to terminate IKE_SA: ID 8 not found