[strongSwan] received TS_UNACCEPTABLE notify, no CHILD_SA built

Wed Feb 7 07:44:48 CET 2018

Hi Noel,

Still cannot establish tunnel. logs doesn't show anything. Can someone 
help to solve this.

Client configuration

config setup

         charondebug="all"
         uniqueids=yes
         strictcrlpolicy=no
conn %default
conn tunnel #
         left=%any
         right=192.168.10.40
         rightsubnet=192.168.10.0/32
         ike=aes128-md5-modp1536
         esp=aes128-sha1
         keyingtries=%forever
         ikelifetime=1h
         lifetime=8h
         dpddelay=30
         #dpdtimeout=120
         #dpdaction=restart
         authby=secret
         auto=start
         keyexchange=ikev2
         type=tunnel
         mobike=no
         #pfs=no
         reauth=no

Server setup

config setup

         charondebug="all"
         uniqueids=yes
         strictcrlpolicy=no
conn %default
conn tunnel #conn %default
conn tunnel #
         left=%any
         right=192.168.10.40
         rightsubnet=192.168.10.0/32
         ike=aes128-md5-modp1536
         esp=aes128-sha1
         keyingtries=%forever
         ikelifetime=1h
         lifetime=8h
         dpddelay=30
         #dpdtimeout=120
         #dpdaction=restart
         authby=secret
         auto=start
         keyexchange=ikev2
         type=tunnel
         mobike=no
         #pfs=no
         reauth=no

root at client:~# *ipsec up tunnel*
initiating IKE_SA tunnel[2] to 192.168.10.40
generating IKE_SA_INIT request 0 [ SA KE No N(NATD_S_IP) N(NATD_D_IP) 
N(HASH_ALG) ]
sending packet: from 192.168.10.38[500] to 192.168.10.40[500] (1064 bytes)
received packet: from 192.168.10.40[500] to 192.168.10.38[500] (38 bytes)
parsed IKE_SA_INIT response 0 [ N(INVAL_KE) ]
peer didn't accept DH group MODP_2048, it requested MODP_1536
initiating IKE_SA tunnel[2] to 192.168.10.40
generating IKE_SA_INIT request 0 [ SA KE No N(NATD_S_IP) N(NATD_D_IP) 
N(HASH_ALG) ]
sending packet: from 192.168.10.38[500] to 192.168.10.40[500] (1000 bytes)
received packet: from 192.168.10.40[500] to 192.168.10.38[500] (392 bytes)
parsed IKE_SA_INIT response 0 [ SA KE No N(NATD_S_IP) N(NATD_D_IP) 
N(HASH_ALG) N(MULT_AUTH) ]
remote host is behind NAT
no IDi configured, fall back on IP address
authentication of '192.168.10.38' (myself) with pre-shared key
establishing CHILD_SA tunnel
generating IKE_AUTH request 1 [ IDi N(INIT_CONTACT) IDr AUTH SA TSi TSr 
N(MULT_AUTH) N(EAP_ONLY) ]
sending packet: from 192.168.10.38[4500] to 192.168.10.40[4500] (332 bytes)
received packet: from 192.168.10.40[4500] to 192.168.10.38[4500] (108 bytes)
parsed IKE_AUTH response 1 [ IDr AUTH N(TS_UNACCEPT) ]
authentication of '192.168.10.40' with pre-shared key successful
IKE_SA tunnel[2] established between 
192.168.10.38[192.168.10.38]...192.168.10.40[192.168.10.40]
scheduling rekeying in 2525s
maximum IKE_SA lifetime 3065s
*received TS_UNACCEPTABLE notify, no CHILD_SA built**
**failed to establish CHILD_SA, keeping IKE_SA**
**establishing connection 'tunnel' failed*
root at client:~#

Ipsec statusall

Status of IKE charon daemon (*strongSwan 5.3.3, Linux 4.4.0-112-generic, 
x86_64*):
   uptime: 41 seconds, since Feb 07 12:08:32 2018
   malloc: sbrk 2703360, mmap 0, used 519216, free 2184144
   worker threads: 7 of 16 idle, 5/0/4/0 working, job queue: 0/0/0/0, 
scheduled: 2
   loaded plugins: charon aes kernel-libipsec des rc2 sha1 sha2 md5 
random nonce x509 revocation constraints pubkey pkcs1 pkcs7 pkcs8 pkcs12 
pgp dnskey sshkey pem openssl fips-prf gmp xcbc cmac hmac curl attr 
kernel-netlink resolve socket-default stroke updown xauth-generic
Listening IP addresses:
   192.168.10.38
   192.168.3.107

Connections:
       tunnel:  %any...192.168.10.40  IKEv2
       tunnel:   local:  uses pre-shared key authentication
       tunnel:   remote: [192.168.10.40] uses pre-shared key authentication
       tunnel:   child:  dynamic === 192.168.10.0/32 TUNNEL
Security Associations (1 up, 0 connecting):
       tunnel[1]: ESTABLISHED 41 seconds ago, 
192.168.10.38[192.168.10.38]...192.168.10.40[192.168.10.40]
       tunnel[1]: IKEv2 SPIs: 53b251675b863a7d_i* 57d33cd8149f729f_r, 
rekeying in 41 minutes
       tunnel[1]: IKE proposal: 
AES_CBC_128/HMAC_MD5_96/PRF_HMAC_MD5/MODP_1536

On Tuesday 16 January 2018 11:23 PM, Noel Kuntze wrote:
> Hi,
>
> Check the logs of the remote side.
> It means the remote peer did not like the proposed traffic selector. It was probably outside of the network range that its own configuration allows, meaning narrowing failed.
>
> Kind regards
>
> Noel
>
>
> On 16.01.2018 07:25, Sujoy wrote:
>> Hi Noel,
>>
>> Same strongswan 5.3.3 configuration working in my VM(client) to desktop server. But not working from my OpenWRT to Global IP used nated Linux server. Can you help me to solve this.
>>
>> what means "received TS_UNACCEPTABLE notify, no CHILD_SA built"
>>
>> Server config file.
>>
>>
>>
>>
>> Thanks & Regards
>>
>> Sujoy
>>
>> On Thursday 04 January 2018 03:38 AM, Noel Kuntze wrote:
>>> Hi,
>>>
>>> Only on the responder.
>>> If you use dpd and enforce UDP encapsulation, you do not need to open any ports on the initiator side.
>>> Refer to the UsableExamples wiki page[1] for example configurations that are usable in the real world.
>>>
>>> Kind regards
>>>
>>> Noel
>>>
>>> [1] https://wiki.strongswan.org/projects/strongswan/wiki/UsableExamples
>>>
>>> On 28.12.2017 08:51, Sujoy wrote:
>>>> Hi All,
>>>>
>>>>
>>>> We want to implement StrongSwan,with IPsec in OpenWRT. IPSec server will be running in CentOS and the OpenWRt router will connect to it using VPN. I have configured the server part, struggling to configure the client part. Do we need to open port 4500 for this first.
>>>>
>>>> Anyone can suggest any solution for this.

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