Restore to SharePoint 2013 – Custom FBA Login Page Error – Could not load file or assembly Microsoft.SharePoint.IdentityModel

INTRODUCTION I have just installed SharePoint 2013 and I’m now in the process of migrating sites. One of the sites has FBA Authentication setup with custom login page. In the custom login page I use SPClaimsUtility.AuthenticateFormsUser to authenticate the user. The site was restored OK in SP 2013 except when I tried to login using […]