Update: sitestreams.twitter.com streaming endpoints should now be fully operational as well.
That means that at this time, all streaming endpoints should be fully operational. If you continue to experience difficulty, please submit the information I posted above with respect to User Streams, but include the hostname and endpoint you’re trying to connect to as well.
We may be shifting traffic between our datacenters without notice, so please make sure that you are not caching DNS records for more than a few minutes at most, so as to allow us to more effectively loadbalance and make sure you’re able to connect.
Thanks for your patience, everyone, and sorry for the inconvenience.