[strongSwan] strongSwan 5.7.2: received retransmit of response with ID 0, but next request already sent

[ynicle at sina.com]

 HI all,
I got a problem on my debian 10 PC box when connecting to a windows VPN server.
The strongSwan always  returns the error:  "received retransmit of response with ID 0, but next request already sent".
Please ref the following log. And most strange thing is the line in red , it seems strongSwan receives the duplicated repsonse from remote 500 port.
Meanwhile I have another Ubuntu 19.04 with strongSwan 5.7.1, and it works fine while connecting the same VPN server.
Any reply will be welcomed.


Sep 29 10:30:39 debian charon: 00[DMN] Starting IKE charon daemon (strongSwan 5.7.2, Linux 4.19.0-6-amd64, x86_64)
Sep 29 10:30:39 debian charon: 00[CFG] loading ca certificates from '/etc/ipsec.d/cacerts'
Sep 29 10:30:39 debian charon: 00[CFG] loading aa certificates from '/etc/ipsec.d/aacerts'
Sep 29 10:30:39 debian charon: 00[CFG] loading ocsp signer certificates from '/etc/ipsec.d/ocspcerts'
Sep 29 10:30:39 debian charon: 00[CFG] loading attribute certificates from '/etc/ipsec.d/acerts'
Sep 29 10:30:39 debian charon: 00[CFG] loading crls from '/etc/ipsec.d/crls'
Sep 29 10:30:39 debian charon: 00[CFG] loading secrets from '/etc/ipsec.secrets'
Sep 29 10:30:39 debian charon: 00[CFG] expanding file expression '/var/lib/strongswan/ipsec.secrets.inc' failed
Sep 29 10:30:39 debian charon: 00[CFG] loading secrets from '/etc/ipsec.d/nm-l2tp-ipsec-435fa988-7950-40c4-b115-22344e7352d0.secrets'
Sep 29 10:30:39 debian charon: 00[CFG]   loaded IKE secret for %any
Sep 29 10:30:39 debian charon: 00[LIB] loaded plugins: charon aesni aes rc2 sha2 sha1 md5 mgf1 random nonce x509 revocation constraints pubkey pkcs1 pkcs7 pkcs8 pkcs12 pgp dnskey sshkey pem openssl fips-prf gmp agent xcbc hmac gcm attr kernel-netlink resolve socket-default connmark stroke updown counters
Sep 29 10:30:39 debian charon: 00[LIB] dropped capabilities, running as uid 0, gid 0
Sep 29 10:30:39 debian charon: 00[JOB] spawning 16 worker threads
Sep 29 10:30:39 debian charon: 05[CFG] received stroke: add connection '435fa988-7950-40c4-b115-22344e7352d0'
Sep 29 10:30:39 debian charon: 05[CFG] added configuration '435fa988-7950-40c4-b115-22344e7352d0'
Sep 29 10:30:40 debian charon: 07[CFG] rereading secrets
Sep 29 10:30:40 debian charon: 07[CFG] loading secrets from '/etc/ipsec.secrets'
Sep 29 10:30:40 debian charon: 07[CFG] expanding file expression '/var/lib/strongswan/ipsec.secrets.inc' failed
Sep 29 10:30:40 debian charon: 07[CFG] loading secrets from '/etc/ipsec.d/nm-l2tp-ipsec-435fa988-7950-40c4-b115-22344e7352d0.secrets'
Sep 29 10:30:40 debian charon: 07[CFG]   loaded IKE secret for %any
Sep 29 10:30:40 debian charon: 09[CFG] received stroke: initiate '435fa988-7950-40c4-b115-22344e7352d0'
Sep 29 10:30:40 debian charon: 11[IKE] initiating Main Mode IKE_SA 435fa988-7950-40c4-b115-22344e7352d0[1] to 211.12.77.221
Sep 29 10:30:40 debian charon: 11[ENC] generating ID_PROT request 0 [ SA V V V V V ]
Sep 29 10:30:40 debian charon: 11[NET] sending packet: from 192.168.3.8[500] to 211.12.77.221[500] (212 bytes)
Sep 29 10:30:40 debian charon: 12[NET] received packet: from 211.12.77.221[500] to 192.168.3.8[500] (208 bytes)
Sep 29 10:30:40 debian charon: 12[ENC] parsed ID_PROT response 0 [ SA V V V V V V ]
Sep 29 10:30:40 debian charon: 12[IKE] received MS NT5 ISAKMPOAKLEY vendor ID
Sep 29 10:30:40 debian charon: 12[IKE] received NAT-T (RFC 3947) vendor ID
Sep 29 10:30:40 debian charon: 12[IKE] received draft-ietf-ipsec-nat-t-ike-02\n vendor ID
Sep 29 10:30:40 debian charon: 12[IKE] received FRAGMENTATION vendor ID
Sep 29 10:30:40 debian charon: 12[ENC] received unknown vendor ID: fb:1d:e3:cd:f3:41:b7:ea:16:b7:e5:be:08:55:f1:20
Sep 29 10:30:40 debian charon: 12[ENC] received unknown vendor ID: e3:a5:96:6a:76:37:9f:e7:07:22:82:31:e5:ce:86:52
Sep 29 10:30:40 debian charon: 12[CFG] selected proposal: IKE:3DES_CBC/HMAC_SHA1_96/PRF_HMAC_SHA1/MODP_1024
Sep 29 10:30:40 debian charon: 12[ENC] generating ID_PROT request 0 [ KE No NAT-D NAT-D ]
Sep 29 10:30:40 debian charon: 12[NET] sending packet: from 192.168.3.8[500] to 211.12.77.221[500] (244 bytes)
Sep 29 10:30:40 debian charon: 13[NET] received packet: from 211.12.77.221[500] to 192.168.3.8[500] (260 bytes)
Sep 29 10:30:40 debian charon: 13[ENC] parsed ID_PROT response 0 [ KE No NAT-D NAT-D ]
Sep 29 10:30:40 debian charon: 13[IKE] local host is behind NAT, sending keep alives
Sep 29 10:30:40 debian charon: 13[IKE] remote host is behind NAT
Sep 29 10:30:40 debian charon: 13[ENC] generating ID_PROT request 0 [ ID HASH ]
Sep 29 10:30:40 debian charon: 13[NET] sending packet: from 192.168.3.8[4500] to 211.12.77.221[4500] (68 bytes)
Sep 29 10:30:40 debian charon: 14[NET] received packet: from 211.12.77.221[500] to 192.168.3.8[500] (260 bytes)
Sep 29 10:30:40 debian charon: 14[IKE] received retransmit of response with ID 0, but next request already sent
Sep 29 10:30:44 debian charon: 06[IKE] sending retransmit 1 of request message ID 0, seq 3
Sep 29 10:30:44 debian charon: 06[NET] sending packet: from 192.168.3.8[4500] to 211.12.77.221[4500] (68 bytes)
Sep 29 10:30:44 debian charon: 05[NET] received packet: from 211.12.77.221[500] to 192.168.3.8[500] (260 bytes)
Sep 29 10:30:44 debian charon: 05[IKE] received retransmit of response with ID 0, but next request already sent
Sep 29 10:30:50 debian NetworkManager[645]: Stopping strongSwan IPsec...
Sep 29 10:30:50 debian charon: 00[DMN] signal of type SIGINT received. Shutting down
Sep 29 10:30:50 debian charon: 00[IKE] destroying IKE_SA in state CONNECTING without notification



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