Problems with applications

I have a problem running some applications such as SKYPE when the Canopies are NAT enabled.Also FTP works with every other browser besides Internet Explorer when NAT enabled,however if a router is added which is NAT enabled and the SM NAT disabled then Internet explore would work.Does any body experience these problems,how could this be resolved?

:evil: :twisted:

Dmz the device and that would clear up a single pc on the antenna