For who have facing missing "Connection" tab on their "Internet Option" don't worry, just follow a few simple step then it will come back again.

Before you do the following step please make sure your computer is clean because this problem normally was cause by virus infection. Please scan your computer by trusted antivirus.

After you clean your computer lets do the following step: -

1) Goto "gpedit.msc" for restore the default setting of "Internet Control Panel".

• Computer Configuration\Administrative Templates\Windows Components\Internet Explorer\Internet Control Panel
• User Configuration\Administrative Templates\Windows Components\Internet Explorer\Internet Control Panel

If you find that the "Disable Connetion Tab" was set "disable" just change it back to "not configured".

After that goto "regedit" and the goto the following path:

• User Key: [HKEY_CURRENT_USER\Software\Policies\Microsoft\Internet Explorer\
  Control Panel]
  System Key: [HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Internet Explorer\
  Control Panel]
  Data Type: REG_DWORD (DWORD Value)
  Value Data: (0 = disable restriction, 1 = enable restriction)

If the value was set "1" please change it to "0".

Now you can check the "Connection" tab is coming back ...