Thank you vary much for your quick answer Claudio,
Just to make sure, you are saying that for external users i only need one third party trusted Cert for the security server and that's it ?
My wildcard certificate is from GoDaddy so it is trusted to the outside world, the wildcard is for my external domain *.MyDomain.com, so can I use this certificate for the Security Server ? no need any inernal names (server.MyDomain.local) in that certificate ?
Thanks!