User Access issue after upgrading the SP 2010 site to SP 2013

Users coming from a SharePoint 2010 system that try to access SharePoint 2013 after a migration receive a “this site has not been shared with you” message. This mean that they are not able to authenticate to SharePoint 2013.

In SharePoint 2013 there is a new authentication mechanism called Claim based authentication. Be default through the UI all Applications are created in this mode.

I created a PowerShell script that loops through all of your SharePoint 2013 web applications and upgrades each one to claim’s based authentication.

Script:

 Param(

    [string]  $account = $(Read-Host -prompt "UserAccount")

    )

Add-PSSnapIn Microsoft.SharePoint.PowerShell

foreach ($wa in get-SPWebApplication)

{

    Write-Host "$($wa.Name) | $($wa.UseClaimsAuthentication )"

    #http://technet.microsoft.com/en-us/library/gg251985.aspx

    $wa.UseClaimsAuthentication = $true

    $wa.Update()

    $account = (New-SPClaimsPrincipal -identity $account -identitytype 1).ToEncodedString()

    $zp = $wa.ZonePolicies("Default")

    $p = $zp.Add($account,"PSPolicy")

    $fc=$wa.PolicyRoles.GetSpecialRole("FullControl")

    $p.PolicyRoleBindings.Add($fc)

    $wa.Update()

    $wa.MigrateUsers($true)

    $wa.ProvisionGlobally()

}

For more information, refer the msdn blog: http://technet.microsoft.com/en-us/library/gg251985.aspx