It seems to work for me. Try from Win 8 Desktop mode and enable compatibility view in IE10 for your VPN domain. Hostchecker would be able to launch. You might also change dsHostChecker.exe to run in Win7 mode in order to pass the endpoint authentication policy.
One user report changing the compatibility view, resolved his problem.
Windows 8.1 + IE11:
In IE11 -> compatibility view settings -> <your IVE domain>
I can confirm that enabling compatibility mode worked for me as well. Host checker loaded properly.
Using IE 11 on Windows 8.1 and connecting to an SA6500 running IVE 7.4r4 and ESAP 2.4.5.