[strongSwan] ERROR 13801

Andreas Steffen andreas.steffen at strongswan.org
Sun Jul 17 12:21:32 CEST 2016

Hi Max,

the error occurring is:

Jul 12 12:27:27
  14[IKE] <IPSec-IKEv2-EAP|1> no private key found for ''

i.e. the VPN server cannot find its server certificate. Since
EAP-MSCHAPv2 is a weak authentication method, the server must always
authenticate itself with a public key method. Therefore you must
change the following two things:

- In /etc/ipsec.conf enable leftcert=vpnHostCert.pem

- The client assumes a server identity of This IPv4
   address must be contained as a subjectAltName in the server
   certificate, otherwise the authentication will not work.
   A much better solution is to configure the client to send the
   fully qualified domain name, i.e. the hostname of the server and
   to include the hostname as a subjectAltName in the server
   certificate. In that case you have to add the following entry
   in ipsec.conf:

   leftid=<fully qualified hostname of vpnHost>

Best regards


Andreas Steffen                         andreas.steffen at strongswan.org
strongSwan - the Open Source VPN Solution!          www.strongswan.org
Institute for Internet Technologies and Applications
University of Applied Sciences Rapperswil
CH-8640 Rapperswil (Switzerland)

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