Internal Error: Unable to check domain availability at this time. Please try again later!
Maybe the whois server is down or there are too many connections to it.
-- HMS Norm
Opinions are my own views, not DreamHosts'.I am NOT a DreamHost employee OK! :@
Act on my advice at your own risk!
We've seen that before, but I don't remember if it was .com, .net, or .org. But it was a temporary glitch in the registrar system. I'd let Support know anyhow, just to make sure they take a look at it.
Which TLD are you querying?
BTW, it did finally work a few hours later.