Is it a public url?
Is it installed in the root of the web site or a virtual directory with something else installed in the root?
Did you use the package mojoportal-2-3-5-5-mssql-net40-deploymentfiles.zip? or did you install the 3.5 version of mojoPortal under .NET 4?
Are you sure there were no transfer errors when ftping the files?
Was this a clean install or moving a site from your local machine or from another installation?