IIS FTP Server on Windows 2008 R2 Standard - Can only logon using administrator user/pass?

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http://serverfault.com – I've setup a FTP server in IIS 7.5 on Windows Server 2008 R2 Standard and enabled Basic Authentication. I have a basic user ("Ropstah") on the server which is in the Users and Some Custom groups. I've allowed the Some Custom group read/write access on the FTP folder. Now when I connect to the server using "Ropstah" I get the following error: 530 User cannot login Why is this? (I am able to login to the FTP using the administrator account though...) Any help would be greatly appreciated! Set in IIS Set in Windows Explorer: (HowTos)