On exchange 2010 mail box server these events are happening every 4 hours exactly.

First event 17 happens three times:

(Process w3wp.exe, PID 7052) "RBAC authorization returns Access Denied for user domain.local/serversou/MBXserver01. Reason: No role assignments associated with the specified user were found on Domain Controller AD1.domain.local"

then immediately it is followed by warning 2937 for two times:

Process MONAD.EXE () (PID=5092). Object [CN=Microsoft Exchange,CN=Services,CN=Configuration,DC=domain,DC=local]. Property [GlobalAddressList] is set to value [domain.local/Configuration/Deleted Objects/Default Global Address List
DEL:5ace3c0a-7992-4ad7-9f1b-a6f44eb115de], it is pointing to the Deleted Objects container in Active Directory. This property should be fixed as soon as possible.

My suggestion is to use ADSI Edit to look at that property for that object specified in the message and change it to the DN of a valid global address list.

Hi,

Step1: Get the current distinguished name of GAL.
Go to ADSIEdit -> DC=domain,DC=local -> CN=Configuration -> CN=Services -> CN=Microsoft Exchange -> CN=Organization Name -> CN=Address Lists Container -> CN=All Global Address Lists -> CN=Default Global Address List
Double click on this object, copy the value of the attribute distinguishedname

Step2: Configure the property
Go to ADSIEdit, find Object [CN=Microsoft Exchange,CN=Services,CN=Configuration,DC=domain,DC=local]
Double click on this object, and choose the GlobalAddressList attribute. Paste the value we get in the Step1.

For event 17, refer to this blog.

http://blogs.technet.com/b/eileenor/archive/2011/04/19/msexchange-rbac-error-17.aspx

Best Regards.