[will.ton]

I setup a GPO in the security settings and assigned the policy Secure Server (require security) which I thought meant it would require all systems to communicate with each other with IPSEC. I set this on the domain level (test environment) and then all of the servers could not talk to each other or the domain controller. I thought since all the machines were on AD they would be able to authenticate with each other?

[kapilsharma11]

1. What authentication you had choosen there.........It should be kerberose.

2. "Require Security" needs IPsec to be configured on all the machines in order to communicate.....But you configured it in domain policy not in domain controller policy so the will not be able to communicate with others......

Regards,

[will.ton]

I did choose Kerberos for the authentication. I did configure it on the domain controller policy and as soon as I did gpupdate /force on one of my systems that system could no longer ping or resolve the domain controller anymore.