Try setting it up for UPnP. This site has instructions for doing it: http://support.dlink.ca/ProductFAQView.asp?FAQID=1004

Also in limewire go to Tools>Options>Advanced>Firewall Config, make sure it's set for UPnP.

This one might be a better link:http://www.neovilla.com/d-link-upnp.html

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If it ain't broke, fix it till it is!