Exchange 2016 Active Directory Issues

We have recently created a new Active Directory and Exchange 2016 environment. The setup consists of the following:

AD01-GC Domain Controller (Windows Server 2012 R2)
AD02-GC Domain Controller (Windows Server 2012 R2)
AD03-GC Domain Controller (Windows Server 2012 R2)
EXCH01-Exchange 2016 Server (Windows Server 2012 R2)

Recently, when accessing the ECP the performance has been very slow with lots of "Please wait spinners". In addition, the "mailbox delegation" section of the "Edit User Mailbox" fails to load.

Yesterday I was able to get the following error popup in ECP complaining about AD02:

"Active Directory operation failed on <domain controller> This error is not retriable. Additional information: Insufficient access rights to perform the operation.

Active directory response: 00002098: SecErr: DSID-03150BB9, problem 4003 (INSUFF_ACCESS_RIGHTS), data 0

The user has insufficient access rights."

After investigating AD01/AD02/AD03/Exchange and not discovering any anomalies in the error logs I decided to shutdown AD02 and to my surprise the Exchange ECP returned to it's normal state.

I am perplexed as to what might be causing this and would greatly appreciate some insight.

Many Thanks,
Mitchell
LVL 1
itcaptainAsked:
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Ganesh GuruduSenior ConsultantCommented:
This is not resolved automatically, you could have changed some settings on Advanced security setting window


Open Active Directory Users and Computers.
Click View, and then click Advanced Features.
Right-click the OU that contains the user and then click Properties.
In the Security tab, click Advanced.
In the Permissions tab, click Add.
In the Enter object name to select box, type Exchange trusted subsystem, and then click OK.
In the Object tab, select This object and all descendant’s objects in the Apply onto list, locate Modify Permissions in the Permissions list, and then set it to Allow.
Click OK
Make sure above option is checked on all OU’S listed in the object path of the user object
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Alex Green3rd Line Server SupportCommented:
Are you a domain admin and exchange admin?
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AmitIT ArchitectCommented:
Lets start with DC troubleshooting. First check if replication is fine across all dc's. Can you also share the hardware specs for all servers.
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compdigit44Commented:
I agree with Amit a AD health check should be done. Please also run the dcdiag /v /e >c:\dcdiag.txt command as well.

What errors or warning are present in our Windows Event logs on teh DC and Exchange servers?
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itcaptainAuthor Commented:
Removing all AD roles from the problematic server and re-adding them corrected the issue.
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AmitIT ArchitectCommented:
Basically, you reinstalled the DC. That's what you are saying?
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itcaptainAuthor Commented:
That's correct.
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itcaptainAuthor Commented:
It was correct
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