Can't get onto the board?

[StingRay]

Can anybody give me some insight why over the last couple of days when on my home pc's I can't log onto this board or My old truck but can log onto any other web site with no problems? I have scanned for viruses and spyware to no avail. E-mail and all other web sites work fine. I keep getting a gateway time out. I have no problems from my work machine. It's only at home that I have this problem. Could my router be causing a problem? Any help is appreciated.