[strongSwan] cannot respond to IPsec SA request because no connection is known

Tobias Brunner tobias at strongswan.org
Thu Aug 16 10:41:38 CEST 2012

Hi Ben,

> I'm trying to connect from behind a standard PAT style NAT to a
> StrongSwan server behind a 1:1 NAT.  The config I'm using worked when
> I was connecting between two hosts on the local subnet.  When I
> deployed the new VPN server behind the firewall at our datacenter, it
> would no longer work (errors included below).  Any idea what I'm doing
> wrong?

Please try 5.0.0 as the pluto IKEv1 daemon of earlier releases has
problems when it is behind a NAT (even 1:1) as responder.


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