Thank to: https://ayalaaii.wordpress.com Error: Active Directory operation failed on FQDN.dc.com. This error is not retriable. Additional information: Access is denied. Active directory response: 00000005: SecErr: DSID-031521D0, problem 4003 (INSUFF_ACCESS_RIGHTS), data 0 I recently found myself with a dilemma, I have an Exchange 2003 and Exchange 2010 environment, and about a week ago, both exchange servers started to have issues with creating mailboxes, updating OAB, etc. I started to troubleshoot the basics “permissions”. These kind of issues normally indicates “permissions”, open Active Diretory Users and Computers, and under view select Advanced Features, then right click your Domain and select Properties afterwards got to the Security tab and it will take you to this section. Now it is very important that if the “Include Inheritable permissions from this objects parent” is cheked you uncheck it Apply setting, then go back check it and Apply...