I have two win2008 D.C. and I get the following critical error (9 errors per second):
09/24 14:17:52 [CRITICAL] Ping from my_DC2 for domain my_DC2.my_domain (null) for (null) on <Local> is invalid since we don’t host the named domain.
could you please help me?
Just to better understand the situation, why do you have two DC’s? One for each location? Backup DC? Are they both in the same forest?
It sounds like your DNS may be off somewhere.
Random account lockout is usually caused by multiple sessions on your network. After a user changes their password you may find that your users have logged onto a system via rdp or exchange and the passwords are not in sync (usually from a different device). The session that is not in sync with the current password will try and reconnect and lock the user out because the password then does not match. I would start looking at exchange connections and then any other applications that are using a terminal services connection for an application. Look at any apps that use saml authentication. There are mulitple utilities that can monitor the session and let you know which server is causing the issue. I hope this helps.