Cannot see my server/websites

Using a NETGEAR N600 Router I cannot see any website(s) I'm working that's on a particular server. Everything is fine and all of a sudden it's like network trouble, but it's not. I can connect my computer direct to the cable modem and it works fine. I even got out my old router and hub and did the hard wire thing all day and all was well.

If I use different computer on wireless it cannot connect to the websites either. Being able to connect hard wired takes care of the network question and having the same issue with a different computer that's never been the anything I'm working on kind of take my computer out of the loop so to speak.

Now to skew thing a little, I was at a friends house for two weeks and went through this exact same scenario. They also had a NETGEAR Router, a cheaper one and I thought their router was the issue but now I don't have a clue as to what the problem is. I went through this three times at my friends house. I could reconnect in about 2-3 days.

I've done everything, rebooted, shut down for hours nothing seems to fix the issue but time.

Any suggestions that money or a well placed hammer blow won't fix?