Trying to troubleshoot an IPSec/IKEv1 VPN connection with Strongswan that is failing to complete phase 2 with NO_PROPOSAL_CHOSEN.
I know the solution for this error is nearly always "double-check your phase 2 proposal", but I am 100% sure that the ESP proposal is correct - it's working on a Windows box using NCP Secure Entry Client (see screenshot below).
From here I see that this error can result from mismatched encryption, auth, PFS or occasionally lifetime proposals. But mine are correct. Is there anything else that can result in NO_PROPOSAL_CHOSEN? (I have sadly no access to the responder so can't check logs or change config there).
ipsec.conf:
config setup
conn VDI
left=%any
leftauth=psk
leftauth2=xauth
leftid=userfqdn:VDI
leftsourceip=%config
right=163.x.y.z
rightauth=psk
aggressive=yes
auto=add
dpdaction=restart
dpddelay=20s
keyexchange=ikev1
lifetime=8h
ikelifetime=8h
modeconfig=pull
xauth_identity=DR400
ike=aes256-sha1-modp2048
esp=aes256-sha2_256-modp2048
ipsec.secrets:
: PSK "zzzzzzzzzzzzzz"
DR400 : XAUTH "xxxxxxxxxx"
charon output:
~$ sudo ipsec up VDI
initiating Aggressive Mode IKE_SA VDI[1] to 163.x.y.z
generating AGGRESSIVE request 0 [ SA KE No ID V V V V V ]
sending packet: from 192.168.1.214[500] to 163.x.y.z[500] (547 bytes)
received packet: from 163.x.y.z[500] to 192.168.1.214[500] (556 bytes)
parsed AGGRESSIVE response 0 [ SA KE No ID V V NAT-D NAT-D V V HASH ]
received DPD vendor ID
received draft-ietf-ipsec-nat-t-ike-02\n vendor ID
received XAuth vendor ID
received unknown vendor ID: bf:c2:2e:98:56:ba:99:36:11:c1:1e:48:a6:d2:08:07:a9:5b:ed:b3:93:02:6a:49:e6:0f:ac:32:7b:b9:60:1b:56:6b:34:39:4d:54:49:75:4e:53:34:79:49:45:4a:4f:50:54:59:77:4f:54:59:79:4f:41:3d:3d
local host is behind NAT, sending keep alives
generating AGGRESSIVE request 0 [ HASH NAT-D NAT-D ]
sending packet: from 192.168.1.214[4500] to 163.x.y.z[4500] (108 bytes)
received packet: from 163.x.y.z[4500] to 192.168.1.214[4500] (124 bytes)
parsed TRANSACTION request 3540227287 [ HASH CPRQ(X_USER X_PWD X_MSG) ]
XAuth message: Please Enter Your User Name and Password :
generating TRANSACTION response 3540227287 [ HASH CPRP(X_USER X_PWD) ]
sending packet: from 192.168.1.214[4500] to 163.x.y.z[4500] (92 bytes)
received packet: from 163.x.y.z[4500] to 192.168.1.214[4500] (124 bytes)
parsed TRANSACTION request 3540227287 [ HASH CPS(ADDR MASK DNS DNS U_DEFDOM X_STATUS) ]
XAuth authentication of 'DR400' (myself) successful
IKE_SA VDI[1] established between 192.168.1.214[VDI]...163.x.y.z[163.x.y.z]
scheduling reauthentication in 27760s
maximum IKE_SA lifetime 28300s
generating TRANSACTION response 3540227287 [ HASH CPA(X_STATUS) ]
sending packet: from 192.168.1.214[4500] to 163.x.y.z[4500] (76 bytes)
generating TRANSACTION request 4217090559 [ HASH CPRQ(ADDR DNS) ]
sending packet: from 192.168.1.214[4500] to 163.x.y.z[4500] (76 bytes)
received packet: from 163.x.y.z[4500] to 192.168.1.214[4500] (92 bytes)
parsed TRANSACTION response 4217090559 [ HASH CPRP(ADDR DNS DNS) ]
installing DNS server 10.132.0.10 via resolvconf
installing DNS server 10.132.0.11 via resolvconf
installing new virtual IP 192.168.246.61
generating QUICK_MODE request 167394241 [ HASH SA No KE ID ID ]
sending packet: from 192.168.1.214[4500] to 163.x.y.z[4500] (444 bytes)
received packet: from 163.x.y.z[4500] to 192.168.1.214[4500] (92 bytes)
parsed INFORMATIONAL_V1 request 3483337871 [ HASH N(NO_PROP) ]
received NO_PROPOSAL_CHOSEN error notify
establishing connection 'VDI' failed
working windows connection:
I have tried various other ESP propsals with the same result, including:
- no
esp=line esp=aes256-sha2_256-modp2048!esp=aes256-sha2_256esp=aes256-sha2_256!esp=aes256-sha1-modp2048
I've also tried setting sha256_96 = yes in ipsec.conf but again it makes no difference.
