I don't know if this is something that can be addressed by the AWB people, but for the past day I've been unable to checkout or update the sources, on machines where it has worked in the past. Using the latest version of tortoise, any attempt results in either the below, or a similar response "the server actively refused the connection" (not sure of the exact wording). I don't think there is a proxy issue.
Checkout from http://svn.code.sf.net/p/autowikibrowser/code/AWB, revision HEAD, Fully recursive, Externals included
Unable to connect to a repository at URL
Error running context: An existing connection was forcibly closed by the remote