Technicolor (and Tompson) routers are generally the issue for this error, as they are not built to industry standards and steal a port for their own use, that Destiny requires. A port that can't actually be reassigned. Check with the manufacturer or your ISP to see if there is a firmware update to fix this issue. I seem to remember someone in Belgium saying there was one. If not, you need to get a router that follows mainstream guidelines ([i]not Technicolor or Tompson brands[/i]). [i]Additionally, your ISP cannot be blocking ports, since that negates any settings you make on your router anyway.[/i]

You can try to contact your ISP to see if there is a firmware update for the router that can fix it, if not you will most likely have the issue until you get a different router/modem. Techincolor and Thompson are the only brands that use the normally available port that d2 uses.