Don't add special bindings for FTP site
Shortly if you add bindings for ftp site, it will start to show abnormal behavior. You may not be able to browse it by IP address or name.
You may see error 530
530-Valid hostname is expected.
Win32 error: No such host is known.
Error details: Hostname didn't match any configured ftp site.
To resolve that simply remove any added bindings for the site and use the FTP name you added in the FTP creation wizard.
HTTP pass the host name in the headers that are passed between the client and server, but FTP does not support that option.