I have a configuration with two servers. One is domain controller, the second is mail server.
The DC is running on MS Windows Server 2012 STD. Further it is running from an ESXi server (so it is virtual) and has 16GB of RAM. It has the following roles installed:
1. Domain Controller (Active Directory)
3. File server
5. Print server
When I try to edit details in Active Directory, it is responding very slow. For example opening an user account takes up to 30 seconds, just to display the settings. When I try to change some items, applying it is taking very long as well. Also, just opening AD takes a long time. Just for the record, this only occurs to AD, all the other configured services are normal and respond quickly.
The DNS server is pointing to itself (127.0.0.1) and when I check the performance it is very regular. I performed a performance check when I tried to open AD which did not show any peaks on Memory, I/O, CPU etc.
Has anyone seen this before, and more important: does anyone have any ideas that can point me to the solution?