Thankyou Tobias for your prompt response. The Gateway configuration for Android 
(strongSwanVPN Client) setting "IKEv2 Certificate + EAP (Username/Password)". 
Thuswe need to configure rightauth2=eap-md5 which was missing. This configures 
asecond authentication round using EAP after doing a first round 
withcertificate authentication. With this, VPN connection gets established. I 
think, it hasnothing to do with constraints and eap-dynamic plugin. 
Pleasecorrect me if I am wrong.
 

    On Thursday, April 28, 2016 10:04 PM, Tobias Brunner 
<[email protected]> wrote:
 

 Hi,

> 12[CFG] constraint requires EAP_MD5, but EAP_NAK was used

You configured rightauth=eap-md5 but your client did not authenticate
with EAP but with its certificate.  Check the client configuration.

Regards,
Tobias



  
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