<div>
Can you verify if you DC/server are activated (genuine) ?<br />
<br />
Regards,<br />
Krzysztof
</div>


Can you verify if you DC/server are activated (genuine) ?

Regards,
Krzysztof

<div>
Remove the member server form domain and rejoin then check
</div>


Remove the member server form domain and rejoin then check

<div>
Have you checked the DNS setting on this server ..Is it pointing to internal DNS ..??<br />
<br />
See below link if it help<br />
<a href="http://support.microsoft.com/kb/938457" rel="ugc nofollow">http://support.microsoft.com/kb/938457</a>
</div>


Have you checked the DNS setting on this server ..Is it pointing to internal DNS ..??

See below link if it help
http://support.microsoft.com/kb/938457 [http://support.microsoft.com/kb/938457]

<div>
I found the solution on my own
</div>


<div>
<div class="content wysiwyg-content">
I have a Windows Server 2008 that have some problems.<br />
<br />
When I try to add a member to a group (Remote Desktop Users) I get this dialog when clicking &quot;Advanced&quot; telling me &quot;<i>The system detected a possible attempt to compromise security. Please ensure that you can contact the server that authenticated you</i>. &quot;<br />
<a href="https://filedb.experts-exchange.com/incoming/2012/09_w38/604199/compromise.png" target="_blank" title="Screen (5 KB)"><img alt="Screen" class="file-block lazyload" style="max-width: 456px;" data-src="https://filedb.experts-exchange.com/incoming/2012/09_w38/604199/compromise.png" /></a><br />
I tried to remove the machine from DNS to see if it reregistered, but it didn't (after reboot).<br />
<br />
On the server where I am trying to add a user to a group, I get this event:<br />

<pre><code id="code-10-27871963-1">The Security System detected an authentication error for the server
ldap/DC2.MyDOMAIN.dk. The failure code from authentication protocol 
Kerberos was &quot;  (0x80080341)&quot;.</code></pre>
<br />
Level: Warning<br />
IEvent ID: 40960<br />
User: SYSTEM<br />
<br />
Any ideas?
</div>
</div>


compromise.png

I have a Windows Server 2008 that have some problems.

When I try to add a member to a group (Remote Desktop Users) I get this dialog when clicking "Advanced" telling me "The system detected a possible attempt to compromise security. Please ensure that you can contact the server that authenticated you. "


I tried to remove the machine from DNS to see if it reregistered, but it didn't (after reboot).

On the server where I am trying to add a user to a group, I get this event:
(CODE)

Level: Warning
IEvent ID: 40960
User: SYSTEM

Any ideas?

No AD connection on server

Active Directory (AD) is a Microsoft brand for identity-related capabilities. In the on-premises world, Windows Server AD provides a set of identity capabilities and services, and is hugely popular (88% of Fortune 1000 and 95% of enterprises use AD). This topic includes all things Active Directory including DNS, Group Policy, DFS, troubleshooting, ADFS, and all other topics under the Microsoft AD and identity umbrella.

Active Directory

Windows Server 2008 and Windows Server 2008 R2, based on the Microsoft Vista codebase, is the last 32-bit server operating system released by Microsoft. It has a number of versions, including including Foundation, Standard, Enterprise, Datacenter, Web, HPC Server, Itanium and Storage; new features included server core installation and Hyper-V.