You probably set a Page as the Login Page - without actually adding the login control to the page first !!

To fix this you will have to edit the Portals table in the Database. and set the LoginTabId field to NULL.

Most Hosting providers provide you with some ability to edit MS SQL Databases, by running SQL scripts.  The script you need is

UPDATE {objectQualifier}Portals
       SET LoginTabId = NULL
WHERE PortalId = xxx

where xxx = is the PortalId of your portal
{objectQualifier} = the objectqualifier you have in the SqlDataProvider part of web.config (empty string bydefault).

If you don't know the Portal Id, try the following:

UPDATE {objectQualifier}Portals
       SET LoginTabId = NULL
WHERE PortalName = xxx

where xxx is the name of the Portal.

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Charles Nurse Chief Architect Evoq Content Team Lead, DNN Corp. Want to contribute to the Platform project? - See here

MVP (ASP.NET) and ASPInsiders Member

I think I am also having this problem; I am completely unable to login. I have set the LoginTabId to null in the dbo.Portals table, but that doesn't fix my problem.

After messing around in the database, I have managed to restore a "login page", but it doesn't contain any login fields. If I could find any documentation of the database structures, I would try to reconstruct the logon. I found the "Account Login" entry in dbo.ModuleDefinitions, and I'm trying to trace it from there. I have already re-created records in dbo.Modules and dbo.TabModules, but I'm probably not done.

Also, could there be some files that I might need to restore?