I had a similar issue when the boards were first switched to the new servers over the weekend - could not get them to load at all when using a machine connected to my home's internet. iPad and IPhones all worked fine when not connected to the wifi.
I called my local service provider (Brighthouse) and explained the issue.
The tech's exact words were 'Oh, the software on your router is VERY old'. He did a remote update, rebooted my router and within minutes I was working fine. This seems counter-intuitive to how server addresses and domain names work but what ever he did fixed the issue.
My advise would be to call your local provider and explain exactly what you're experiencing. My guess is they will walk you through some things (clear DNS, ping the site, etc) and that will help them diagnose the issue.