A specific user is unable to concurrently login to the same Sharepoint site. I thought concurrent logins were default, unless specifically prevented. The user first logged onto the site using the Safari browser and despite removing cookies and rebooting the MAC, no success. I have deleted and added the user again from group, the error still comes up..."You are already logged in as domain\username". We are using SP Foundation on Win2008. Please help!

Hi, Are you using claim based authentication? If yes then refer this http://online.appdev.com/edge/blogs/doug_ware/archive/2011/05/19/fixing-sharepoint-claims-authentication-and-sign-out.aspx I hope this will help you out.Thanks, Rahul Rashu

Thanks. No we are not.