If you use our streaming APIs, you should be aware of a change that’s coming in a couple months: We are updating the SSL certificates for userstream.twitter.com and stream.twitter.com on November 4, 2013.
At that time, the User Streams root certificate will change. The new certificate for the User Streams API will be signed against the Verisign G3 root. Before November 4, you must verify that any User Streams code will work with the new root. If it doesn’t, you’ll need to install the new certificate, which you can install from this page, which also links to a test server that you can use to test your code.
The stream.twitter.com certificate is already signed against the Verisign G3 root, so clients currently connecting to this domain already have the appropriate root certificates installed.