Required valid host name when logging FTP

Last week we had an issue with the users who were actually trying to get to our newly built FTP sites which were currently migrated from iis6 to iis7

user were getting they need to use the valid hostname inorder to login

Later found from the team that there is special way to login these

When you are using FTP virtual hosts you need to specify the host name as part of the login; for example:

c:\>ftp sitename.com|username

this should work.