I have a new N900 where I have had issues connecting to web sites. I only have wired connections, and wireless is disabled.
Out of the box, I would randomly lose theability to connecto web sites. What is interestuing is that if I had several tabs open in Win 7 browser, I would lose them one at a time, rather than all at once. It acted like they were timing out .
I upgraded to the latest firmware, and this still happened, although I could connect to the admin panel of the router.
I have follwed other treads here, and some people that report this behavior, also state that downloads keep going. That makes me think that the connection itself is not failing.
Suspecting it could be a DNS related issue, I disabled DNS relay in the LAN settings.
So far, so good.