Happened something similar with me yesterday, I was unable to access community from the Chrome Browser for some reason. But when I tried it with Internet Explorer it was working fine. So I decided to restart my computer and everything went want to normal. Not sure if this is related or not, but I thought I might as well share it.
Bill has the access been better? In the future @mention me and Andy with the exact time/day that you couldn't access along with screen shot or text of the error message (result when you try to access).
We have ran some optimization updates so hopefully that isn't occurring any longer.