530 valid hostname is expected
To set up multiple FTPs on IIS 8.0, make sure to remove virtual host-names from bindings and use unique ports for each connection for routing.
530 User cannot log in, home directory inaccessible
Let pathname be the location of your FTPs home directory. Open a command prompt as admin and type:
ICACLS "pathname" /Grant IUSR:R /T
ICACLS "pathname" /Grant IUSR:W /T