[strongSwan] IPSec session not getting established

Tobias Brunner tobias at strongswan.org
Tue Aug 4 10:52:05 CEST 2015

Hi Ashok,

> I am trying to establish simple PSK IPSec session between 2 ubuntu systems.
> ...
> Aug  3 19:15:55 user-Lenovo-Product charon: 14[IKE] no private key found for 'moon.strongswan.org'
> ...
> May I know what am I missing?

A lesson in reading the log and status output perhaps ;-)  The log
message above indicates that the daemon does not find a _private_ key,
not a _shared_ key.  That's because the connection is set to use public
key authentication, not pre-shared key authentication, as can be seen in
the output here:

> root at user-Lenovo-Product:/home/user# ipsec statusall
> ...
>         home:  IKEv1/2
>         home:   local:  [moon.strongswan.org] uses public key authentication
>         home:   remote: [ashok at strongswan.org] uses public key authentication

This is, of course, due to the `left|rightauth=psk` options you
commented out in ipsec.conf (the default is `pubkey`):

> conn home
>         left=
>         leftid=@moon.strongswan.org
> #        leftauth=psk
> #       leftauth=pubkey
>         leftsubnet=
>         leftfirewall=yes
>         right=
>         rightid=ashok at strongswan.org
>         rightsubnet=
> #        rightauth=psk
>         ike=3des-md5-modp768!
>         esp=aes128-sha1-modp1024!
> #        auto=add
>         auto=start


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