Problem in adding external user with FBA

The forms-based authentication (FBA) provider supports authentication against credentials stored in Active Directory, in a database such as a SQL Server database, or in a Lightweight Directory Access Protocol (LDAP) data store such as Novell eDirectory, Novell Directory Services (NDS), or Sun ONE.

I had issue with form based authentication i get the below error when try to add new external user to SharePoint group.

The user or group '' is unknown.   at Microsoft.SharePoint.Utilities.SPUtility.FilterValidLoginName(String loginName, SPSite site) 
   at Microsoft.SharePoint.SPUserCollection.FilterConvertSPUserInfoArray(SPUserInfo[] userInfoArray) 
   at Microsoft.SharePoint.SPUserCollection.AddCollection(SPUserInfo[] addUsersInfo) 
   at Microsoft.SharePoint.ApplicationPages.AclInv.BtnOK_Click(Object sender, EventArgs e) 
   at System.Web.UI.WebControls.Button.OnClick(EventArgs e) 
   at System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) 
   at System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) 
   at System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) 
   at System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) 
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

Most of time fix to this kind of issues is correct configuration of Authentication Providers in Central administration. Same worked for me too. I followed the below two links to resolve my problem:


About Rajan
I am Rajan Garg working as a Senior Software Engineer in a company. I am working on the Microsoft technologies.

Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

%d bloggers like this: