Situation: The client is running Exchange 2010 on Windows 2012 R2 Domain Controller. After they demoted one of DCs, they can’t login the Exchange server.
Troubleshooting: 1. Make sure you have correct DNS settings on Exchange serve.
2. The problem could be a result of the Exchange Management Console caching the domain controller details in the MMC temp files. It caches the data but it’s not smart enough to update the data or locate another DC. To fix the issue you have to remove the MMC cache file from the users profile.
Use the following steps to clear the EMC MMC cache file:
1) Close the EMC if you have it open
2) Go to the User’s profile directory and delete the Exchange Management Console file.
3) File location can be found here:
- C:\users\<specific user>\AppData\Roaming\Microsoft\MMC\Exchange Management Console
4) Reopen the EMC
