Client IPSEC ???
i am using ShrewSoft for Access to Pfsense on Windows 7/ Windows 10.
Last standard version is about July 2013 and so it isn't updated.
What is your client Application with IPSEC VPN ?
Use IKEv2 and then the OS native client in Windows 7/8/10 works fine, no need for add-ons.
And android (SAMSUNG) //// ios. it's supported with ikev2 with native app without add-on ?
Android won't work with the native IPsec with or without IKEv2, last I knew.
Load and use the strongSwan app. It's free and works perfectly.
Now iam using ipsec with android 6 (SAMSUNG) BUT WITH IKEV1 not IKev2
WITH older version it's not work.