Cannot create My Sites - Event 5187 (SharePoint Server 2010)
Applies to: SharePoint Server 2010
Alert Name: Cannot create My Sites
Event ID: 5187
Summary: If a Microsoft SharePoint Server 2010 user tries to open their My Site for the first time, and the My Site does not exist, SharePoint Server 2010 provisions the My Site collection for the user. This event is logged if SharePoint Server 2010 could not create the My Site.
Symptoms: One or more of the following symptoms might appear:
Users receive an error message that their My Site could not be created.
This event appears in the event log: Event ID: 5187 Description: My Site creation failure for user '<User ID>' for site url '<User URL>'. The exception was: <Exception>.
Cause: There is a naming conflict caused by the Site Naming Format setting.
Resolution: Change the Site Naming Format setting in Central Administration
Verify that the user account that is performing this procedure is a member of the Farm Administrators group.
On the Central Administration Home page, click Application Management.
On the Application Management page, in the Service Applications section, click Manage service applications.
On the Service Applications page, click the User Profile service.
On the User Profile Service page, in the My Site Settings section, click Setup My Sites.
On the My Site Settings page, in the Site Naming Format section, click either User name (resolve conflicts by using domain_username) or Domain and user name (will not have conflicts).
Click OK.