Step -1:- Go to /home/fes/public/defaultclientsettings.js and Set below settings
VPN_JAVA_DISABLE_IPV6_REDIRECTION=true
VPN_UPDATE_JAVA_DEPLOYMENT_PROPERTIES=true
Step 2:- Java (properties) > Security > Exception List > Add the Server address(Usr base Machine)
Step-3:- Use Client version 5.2.3.8232 or above