The wrong router password/username is a symptom that the Setup Assistant isn't able to connect through your router via Universal Plug and Play (uPnP). It doesn't actually mean specifically that you provided the wrong credentials. If you're router has uPnP options, its probably disabled or using an earlier version of the standard. You can try enabling uPnP within its menu or finding a firmware upgrade to update the router.
Another way is to bypass the process, by opting for the "If you're an advance user and would like to configure your router manually" part of the "Setup Internet Viewing" portion of "Setup Assistant". There you'll see an checkbox for "My router is not listed" check mark and click next and you'll get a screen summarizing your Slingbox's information. This is the information you'll need to create the necessary port forwarding rules on you router.
If you still need step by step instructions on how to create port forwarding rules, then check this webpage (http://portforward.com/english/applications/port_forwarding/SlingBox/SlingBoxindex.htm), and you should find one that represents your router. Once you've created the port forwarding rule, then go back to the setup assistant and continue stepping through it to test if your rules are working.
You can also test them from (http://www.canyouseeme.org/) to get a little more verbage of the actual problem. In some cases, the broadband modem also has its own firewall which will need to be setup to relay port forwarding rules to the router as described in this article (http://support.slingbox.com/get/KB-005033.html).
Im just confused because about a year ago I set up the slingbox with the same router using the setup assistant and not using it manually, although it was a PITA as well. Ill see if I can enable uPnP or do it manually.
Although, when I did try to configure it manually I followed slingbox's directions for verizon but they seem to be out of date as they tell me to do things that are not on the same screen and such.
Im trying to do this manually now and still cant seem to get it to work. Ive created a port forward on my router as follows:
The IP address is the one slingbox setup gave me when I said my router is not listed, that is under network computer/device
TCP Any -> Any
Wan Connection Type:
All Broadband Devices
It still does not work although I tried to follow the instructions as best I could given the options I had for creating a port forward.
The only other options I have to configure are destination ports and source ports
Thanks very much eferz btw.