IKEv1 阶段 2 以 NO_PROPOSAL_CHOSEN 失败，但 ESP 提议是正确的。还有什么可能导致此失败？

尝试对使用 NO_PROPOSAL_CHOSEN 无法完成第 2 阶段的 Strongswan 的 IPSec/IKEv1 VPN 连接进行故障排除。

我知道这个错误的解决方案几乎总是“仔细检查你的第 2 阶段提案”，但我 100% 确定 ESP 提案是正确的——它正在使用 NCP 安全入口客户端的 Windows 机器上运行（见下面的屏幕截图）。

从这里我看到这个错误可能是由于不匹配的加密、身份验证、PFS 或偶尔的生命周期提议造成的。但我的是正确的。 还有什么会导致 NO_PROPOSAL_CHOSEN 的吗？ （遗憾的是，我无法访问响应者，因此无法在那里检查日志或更改配置）。

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"

卡龙输出：

~$ 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

工作窗口连接：

我尝试了其他各种 ESP 提案，结果相同，包括：

• 没有esp=线
• esp=aes256-sha2_256-modp2048!
• esp=aes256-sha2_256
• esp=aes256-sha2_256!
• esp=aes256-sha1-modp2048

我也尝试过设置sha256_96 = yes，ipsec.conf但同样没有区别。