Trac Login Required Plugin
This is a plugin for Trac which redirects all unauthenticated requests to the login page. This lets you easily disallow anonymous access, without the messy juggling of permissions from the anonymous to authenticated groups and without the confusing "permission denied" error page.
Please note that this software is currently in "beta" state. It may clash with other plugins; your testing feedback is appreciated! I use the AccountManagerPlugin with cookie-based web login; it or some similar cookie/web auth plugin is required for this plugin to function correctly - it won't work with HTTP auth.
Similar or Identical Plugins
It turns out that some users of AccountManagerPlugin have solved the same issue; the following plugins offer similar or identical functionality:
If you have any issues, create a new ticket.
Download and install from the Python Package Index: pypi:TracLoginRequiredPlugin
$> sudo easy_install TracLoginRequiredPlugin