Troubleshooting AD security permissions issues in CRM
This might help to troubleshoot or isolate issue caused due to permission. For instance:
There are plenty of places at which security permissions could be applied and marked for inheritance. If you're trying to figure out who has control over child objects in the Services OU, the task can be daunting. This type of scenario is where most AD permissions issues occur.
In order to troubleshoot/ isolate issues we need to know the effective set of permissions that any given user or group has to a particular object. That's your starting point for troubleshooting the problem. Fortunately, AD provides an Effective Permissions tool. Start by selecting Advanced Features from the View menu in the AD console (in this case, Active Directory Users and Computers) to enable these features. Then open the properties for the object you need to investigate. On the Security tab, click Advanced, then select he Effective Permissions tab. Click Select to choose a user or group. As below screenshot shows, AD will then display the effective permissions for that user or group.
From here you can drill down to the issues that are caused due to group membership or inherited permissions.
To know more about CRM Permission perquisites, please refer to below article:
Also, you can refer to below few tools or methods to troubleshoot/analyze the security permission issues:
Once this is enabled, if there is a failure, it will show up in the Security event log.
Last but not the least, you can use proc mon tool to monitor any failure due to permission issue
Please follow below articles which pretty much explains, all the required permissions in CRM Setup