Finally, I have the answer. Support says the problem is theirs. "Okay, so I’ve gotten an update on this matter. Apparently, the QuickTime
Streaming Server is having the issues that it is because of the way that
our admin team has set up your server cluster. Basically, since
everything in that collection of servers is plugging along on its own
network segment (completely isolated from parts of our network to test a
new security model) things aren’t going to work until we get a server up
and running for QuickTime Streaming on your cluster. I’m terribly sorry
It’s something that’s been on our plate for ages, and a member of our
admin team will try to get this remedied as soon as we get the hardware
in to set it up. Fortunately, there’s new hardware being delivered next
week. I know you really want to get to things now - and I don’t blame
you at all - but that’s honestly what is going on and why you can’t set
up QuickTime Streaming Server on your site now. Please accept my most
humble apologies for this."
The above is from the DreamHost Support Team.
I was getting very tired of staff asking if I had read the wiki. And I was ready to change my praise of dreamhost to a warning that they should not be used if a person wanted to stream video. But I really like the honesty of this message and my faith in them is renewed.