When accessing ECP or OWA on your Exchange server you will be the below Server Error saying that No Suitable Directory Servers Found in Site and connected Sites. On the Event Viewer you will get the error 0x80040a02 (DSC_E_NO_SUITABLE_CDC).
The below solution if for Exchange 2003, 2007, 2010 and 2013. Open the Domain’s Group Policy Management and edit the Default Domain Controllers Policy or your server policy as below.
Computer Configuration
Policies
Windows Settings
Security Settings
Local Policies
User Rights Assignment
Mange auditing and security log
Add ‘Exchange Servers‘ or ‘Exchange Enterprise Servers‘ to that policy.
Restart the Exchange server to apply the computer configuration.