To resolve the problem of sharepoint can not login
You have to add a new Multi-String registry key named “BackConnectionHostNames”in SharePoint server atHKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa\MSV1_0 and set the host names with values (for example “partner.solutions2share.intern).
http://blog.solutions2share.net/2013/01/cant-login-to-sharepoint-2013-site-when.html
http://www.harbar.net/archive/2009/07/02/disableloopbackcheck-amp-sharepoint-what-every-admin-and-developer-should-know.aspx