Linux – Disable NTP server providing time sync to anonymous clients on the Internet

Now it seems you're not communicating with your peers. Either they're not up, not reachable, or a firewall or similar device is blocking UDP port 123.

207.32.191.59 appears to be a working stratum 2 server to me, so if the machine otherwise has working Internet access, I'd bet on a firewall.

The policy you have listed should only be applied to the PDC. In fact, since only one server in your domain is the PDC, I don't even recommend using this GP setting, but instead, set it in the registry directly on the PDC DC (shameless plug for my blog entry on how to do this: http://wp.me/pZ5Rx-3v). If you insist on doing this via Group Policy, be sure to target the GPO to ONLY the PDC DC (no other computers, not even other DCs). If the policy is applied to other machines, they will all act as NTP clients, contacting the NTP server directly.

By default, domain-joined clients are set to use the Windows Time Service. So, once you clear out this GPO, the domain clients should revert to Windows Time Service automatically.

As for the command in the login script, you won't need it once you clean up the GPO, so it's safe to remove. It was likely put there by the person who originally crafted the GPO, since they couldn't figure out how to get the clients to use the PDC for time...