I have been having a weird issue with my ACS server. Clients that are configured for our wireless cannot login. We have internal laptops to auth. by machine name. This way anyone in our domain can log into the laptop. Once in awhile the user receive a "domain cannot be found" msg. We watch the authentication process with an analyzer and can tell authentication is not taking place. We reboot the ACS server and everything works. Has anyone seen this or know what is going on.....or where to look?