I just tried accessing several Typepad blogs and I’m getting the same error for each:
You don’t have permission to access / on this server.
Additionally, a 403 Forbidden error was encountered while trying to use an ErrorDocument to handle the request.
This must be affecting many, many blogs. Hopefully they’ll get the service back up and running soon. If you’re reading this and have a Typepad account, you may want to check with customer support.