FTP IIS Manager has stopped working

Hi,

I am trying to add FTP site under IIS  10 and each time IIS Manager keep crashing it just says : "IIS Manager has stopped working"

This is the error log in the event viewer:

IISMANAGER_CRASH

IIS Manager terminated unexpectedly.

Exception:System.Net.Sockets.SocketException (0x80004005): No such host is known
   at System.Net.Dns.GetAddrInfo(String name)
   at System.Net.Dns.InternalGetHostByName(String hostName, Boolean includeIPv6)
   at System.Net.Dns.GetHostAddresses(String hostNameOrAddress)
   at Microsoft.Web.Management.Ftp.Sites.FtpBindingControl.InitializeIPAddresses()
   at Microsoft.Web.Management.Ftp.Sites.FtpBindingControl.InitializeComponent()
   at Microsoft.Web.Management.Ftp.Sites.SiteBindingSslWizardPage.InitializeComponent()
   at Microsoft.Web.Management.Ftp.Sites.SiteBindingSslWizardPage..ctor()
   at Microsoft.Web.Management.Ftp.Sites.SiteFtpPublishingWizardForm.GetWizardPages()
   at Microsoft.Web.Management.Client.Win32.WizardForm.OnLoad(EventArgs e)
   at Microsoft.Web.Management.Ftp.Sites.SiteFtpPublishingWizardForm.OnLoad(EventArgs e)
   at System.Windows.Forms.Form.OnCreateControl()
   at System.Windows.Forms.Control.CreateControl(Boolean fIgnoreVisible)
   at System.Windows.Forms.Control.CreateControl()
   at System.Windows.Forms.Control.WmShowWindow(Message& m)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.Form.WmShowWindow(Message& m)
   at Microsoft.Web.Management.Client.Win32.BaseForm.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

Process:InetMgr

Any help is appreciated.
Thanks in advance.